contractnumber provider added, old provider number field only if no previous contact exist

backend/dist/services/contract.service.d.ts

@@ -119,8 +119,12 @@ export declare function getAllContracts(filters: ContractFilters): Promise<{
         cancellationPeriodId: number | null;
         contractDurationId: number | null;
         previousContractId: number | null;
+        previousProviderId: number | null;
+        previousCustomerNumber: string | null;
+        previousContractNumber: string | null;
         providerId: number | null;
         tariffId: number | null;
+        contractNumberAtProvider: string | null;
         priceFirst12Months: string | null;
         priceFrom13Months: string | null;
         priceAfter24Months: string | null;
@@ -256,6 +260,7 @@ export declare function getContractById(id: number, decryptPassword?: boolean):
     } & {
         id: number;
         meterId: number | null;
+        previousCustomerNumber: string | null;
         contractId: number;
         maloId: string | null;
         annualConsumption: number | null;
@@ -264,7 +269,6 @@ export declare function getContractById(id: number, decryptPassword?: boolean):
         unitPrice: number | null;
         bonus: number | null;
         previousProviderName: string | null;
-        previousCustomerNumber: string | null;
     }) | null;
     stressfreiEmail: {
         id: number;
@@ -445,6 +449,7 @@ export declare function getContractById(id: number, decryptPassword?: boolean):
         } & {
             id: number;
             meterId: number | null;
+            previousCustomerNumber: string | null;
             contractId: number;
             maloId: string | null;
             annualConsumption: number | null;
@@ -453,7 +458,6 @@ export declare function getContractById(id: number, decryptPassword?: boolean):
             unitPrice: number | null;
             bonus: number | null;
             previousProviderName: string | null;
-            previousCustomerNumber: string | null;
         }) | null;
         carInsuranceDetails: {
             id: number;
@@ -549,8 +553,12 @@ export declare function getContractById(id: number, decryptPassword?: boolean):
         cancellationPeriodId: number | null;
         contractDurationId: number | null;
         previousContractId: number | null;
+        previousProviderId: number | null;
+        previousCustomerNumber: string | null;
+        previousContractNumber: string | null;
         providerId: number | null;
         tariffId: number | null;
+        contractNumberAtProvider: string | null;
         priceFirst12Months: string | null;
         priceFrom13Months: string | null;
         priceAfter24Months: string | null;
@@ -572,6 +580,16 @@ export declare function getContractById(id: number, decryptPassword?: boolean):
         status: import(".prisma/client").$Enums.ContractStatus;
         contractNumber: string;
     } | null;
+    previousProvider: {
+        id: number;
+        isActive: boolean;
+        createdAt: Date;
+        updatedAt: Date;
+        name: string;
+        portalUrl: string | null;
+        usernameFieldName: string | null;
+        passwordFieldName: string | null;
+    } | null;
 } & {
     id: number;
     customerId: number;
@@ -595,8 +613,12 @@ export declare function getContractById(id: number, decryptPassword?: boolean):
     cancellationPeriodId: number | null;
     contractDurationId: number | null;
     previousContractId: number | null;
+    previousProviderId: number | null;
+    previousCustomerNumber: string | null;
+    previousContractNumber: string | null;
     providerId: number | null;
     tariffId: number | null;
+    contractNumberAtProvider: string | null;
     priceFirst12Months: string | null;
     priceFrom13Months: string | null;
     priceAfter24Months: string | null;
@@ -764,6 +786,7 @@ export declare function createContract(data: ContractCreateData): Promise<{
     energyDetails: {
         id: number;
         meterId: number | null;
+        previousCustomerNumber: string | null;
         contractId: number;
         maloId: string | null;
         annualConsumption: number | null;
@@ -772,7 +795,6 @@ export declare function createContract(data: ContractCreateData): Promise<{
         unitPrice: number | null;
         bonus: number | null;
         previousProviderName: string | null;
-        previousCustomerNumber: string | null;
     } | null;
     carInsuranceDetails: {
         id: number;
@@ -881,8 +903,12 @@ export declare function createContract(data: ContractCreateData): Promise<{
     cancellationPeriodId: number | null;
     contractDurationId: number | null;
     previousContractId: number | null;
+    previousProviderId: number | null;
+    previousCustomerNumber: string | null;
+    previousContractNumber: string | null;
     providerId: number | null;
     tariffId: number | null;
+    contractNumberAtProvider: string | null;
     priceFirst12Months: string | null;
     priceFrom13Months: string | null;
     priceAfter24Months: string | null;
@@ -1011,6 +1037,7 @@ export declare function updateContract(id: number, data: Partial<ContractCreateD
     } & {
         id: number;
         meterId: number | null;
+        previousCustomerNumber: string | null;
         contractId: number;
         maloId: string | null;
         annualConsumption: number | null;
@@ -1019,7 +1046,6 @@ export declare function updateContract(id: number, data: Partial<ContractCreateD
         unitPrice: number | null;
         bonus: number | null;
         previousProviderName: string | null;
-        previousCustomerNumber: string | null;
     }) | null;
     stressfreiEmail: {
         id: number;
@@ -1200,6 +1226,7 @@ export declare function updateContract(id: number, data: Partial<ContractCreateD
         } & {
             id: number;
             meterId: number | null;
+            previousCustomerNumber: string | null;
             contractId: number;
             maloId: string | null;
             annualConsumption: number | null;
@@ -1208,7 +1235,6 @@ export declare function updateContract(id: number, data: Partial<ContractCreateD
             unitPrice: number | null;
             bonus: number | null;
             previousProviderName: string | null;
-            previousCustomerNumber: string | null;
         }) | null;
         carInsuranceDetails: {
             id: number;
@@ -1304,8 +1330,12 @@ export declare function updateContract(id: number, data: Partial<ContractCreateD
         cancellationPeriodId: number | null;
         contractDurationId: number | null;
         previousContractId: number | null;
+        previousProviderId: number | null;
+        previousCustomerNumber: string | null;
+        previousContractNumber: string | null;
         providerId: number | null;
         tariffId: number | null;
+        contractNumberAtProvider: string | null;
         priceFirst12Months: string | null;
         priceFrom13Months: string | null;
         priceAfter24Months: string | null;
@@ -1327,6 +1357,16 @@ export declare function updateContract(id: number, data: Partial<ContractCreateD
         status: import(".prisma/client").$Enums.ContractStatus;
         contractNumber: string;
     } | null;
+    previousProvider: {
+        id: number;
+        isActive: boolean;
+        createdAt: Date;
+        updatedAt: Date;
+        name: string;
+        portalUrl: string | null;
+        usernameFieldName: string | null;
+        passwordFieldName: string | null;
+    } | null;
 } & {
     id: number;
     customerId: number;
@@ -1350,8 +1390,12 @@ export declare function updateContract(id: number, data: Partial<ContractCreateD
     cancellationPeriodId: number | null;
     contractDurationId: number | null;
     previousContractId: number | null;
+    previousProviderId: number | null;
+    previousCustomerNumber: string | null;
+    previousContractNumber: string | null;
     providerId: number | null;
     tariffId: number | null;
+    contractNumberAtProvider: string | null;
     priceFirst12Months: string | null;
     priceFrom13Months: string | null;
     priceAfter24Months: string | null;
@@ -1391,8 +1435,12 @@ export declare function deleteContract(id: number): Promise<{
     cancellationPeriodId: number | null;
     contractDurationId: number | null;
     previousContractId: number | null;
+    previousProviderId: number | null;
+    previousCustomerNumber: string | null;
+    previousContractNumber: string | null;
     providerId: number | null;
     tariffId: number | null;
+    contractNumberAtProvider: string | null;
     priceFirst12Months: string | null;
     priceFrom13Months: string | null;
     priceAfter24Months: string | null;
@@ -1462,6 +1510,7 @@ export declare function createFollowUpContract(previousContractId: number): Prom
     energyDetails: {
         id: number;
         meterId: number | null;
+        previousCustomerNumber: string | null;
         contractId: number;
         maloId: string | null;
         annualConsumption: number | null;
@@ -1470,7 +1519,6 @@ export declare function createFollowUpContract(previousContractId: number): Prom
         unitPrice: number | null;
         bonus: number | null;
         previousProviderName: string | null;
-        previousCustomerNumber: string | null;
     } | null;
     carInsuranceDetails: {
         id: number;
@@ -1579,8 +1627,12 @@ export declare function createFollowUpContract(previousContractId: number): Prom
     cancellationPeriodId: number | null;
     contractDurationId: number | null;
     previousContractId: number | null;
+    previousProviderId: number | null;
+    previousCustomerNumber: string | null;
+    previousContractNumber: string | null;
     providerId: number | null;
     tariffId: number | null;
+    contractNumberAtProvider: string | null;
     priceFirst12Months: string | null;
     priceFrom13Months: string | null;
     priceAfter24Months: string | null;

backend/dist/services/contract.service.js

@@ -119,6 +119,7 @@ async function getContractById(id, decryptPassword = false) {
             provider: true,
             tariff: true,
             contractCategory: true,
+            previousProvider: true,
             previousContract: {
                 include: {
                     energyDetails: { include: { meter: { include: { readings: true } }, invoices: true } },

backend/dist/services/contractCockpit.service.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"contractCockpit.service.d.ts","sourceRoot":"","sources":["../../src/services/contractCockpit.service.ts"],"names":[],"mappings":"AAAA,OAAO,EAAgB,cAAc,EACpC,MAAM,gBAAgB,CAAC;AAMxB,MAAM,MAAM,YAAY,GAAG,UAAU,GAAG,SAAS,GAAG,IAAI,GAAG,MAAM,CAAC;AAElE,MAAM,WAAW,YAAY;IAC3B,IAAI,EAAE,MAAM,CAAC;IACb,KAAK,EAAE,MAAM,CAAC;IACd,OAAO,EAAE,YAAY,CAAC;IACtB,aAAa,CAAC,EAAE,MAAM,CAAC;IACvB,OAAO,CAAC,EAAE,MAAM,CAAC;CAClB;AAED,MAAM,WAAW,eAAe;IAC9B,EAAE,EAAE,MAAM,CAAC;IACX,cAAc,EAAE,MAAM,CAAC;IACvB,IAAI,EAAE,MAAM,CAAC;IACb,MAAM,EAAE,cAAc,CAAC;IACvB,QAAQ,EAAE;QACR,EAAE,EAAE,MAAM,CAAC;QACX,cAAc,EAAE,MAAM,CAAC;QACvB,IAAI,EAAE,MAAM,CAAC;KACd,CAAC;IACF,QAAQ,CAAC,EAAE;QACT,EAAE,EAAE,MAAM,CAAC;QACX,IAAI,EAAE,MAAM,CAAC;KACd,CAAC;IACF,MAAM,CAAC,EAAE;QACP,EAAE,EAAE,MAAM,CAAC;QACX,IAAI,EAAE,MAAM,CAAC;KACd,CAAC;IACF,YAAY,CAAC,EAAE,MAAM,CAAC;IACtB,UAAU,CAAC,EAAE,MAAM,CAAC;IACpB,MAAM,EAAE,YAAY,EAAE,CAAC;IACvB,cAAc,EAAE,YAAY,CAAC;CAC9B;AAED,MAAM,WAAW,cAAc;IAC7B,cAAc,EAAE,MAAM,CAAC;IACvB,aAAa,EAAE,MAAM,CAAC;IACtB,YAAY,EAAE,MAAM,CAAC;IACrB,OAAO,EAAE,MAAM,CAAC;IAChB,UAAU,EAAE;QACV,qBAAqB,EAAE,MAAM,CAAC;QAC9B,cAAc,EAAE,MAAM,CAAC;QACvB,kBAAkB,EAAE,MAAM,CAAC;QAC3B,WAAW,EAAE,MAAM,CAAC;QACpB,eAAe,EAAE,MAAM,CAAC;QACxB,SAAS,EAAE,MAAM,CAAC;QAClB,gBAAgB,EAAE,MAAM,CAAC;QACzB,SAAS,EAAE,MAAM,CAAC;KACnB,CAAC;CACH;AAED,MAAM,WAAW,aAAa;IAC5B,SAAS,EAAE,eAAe,EAAE,CAAC;IAC7B,OAAO,EAAE,cAAc,CAAC;IACxB,UAAU,EAAE;QACV,YAAY,EAAE,MAAM,CAAC;QACrB,WAAW,EAAE,MAAM,CAAC;QACpB,MAAM,EAAE,MAAM,CAAC;KAChB,CAAC;CACH;AAyED,wBAAsB,cAAc,IAAI,OAAO,CAAC,aAAa,CAAC,CAod7D"}

backend/dist/services/contractCockpit.service.js

@@ -307,6 +307,16 @@ async function getCockpitData() {
             });
             summary.byCategory.missingData++;
         }
+        // 4b. KEINE VERTRAGSNUMMER BEIM ANBIETER
+        if (!contract.contractNumberAtProvider) {
+            issues.push({
+                type: 'missing_contract_number',
+                label: 'Vertragsnummer fehlt',
+                urgency: 'warning',
+                details: 'Vertragsnummer beim Anbieter fehlt',
+            });
+            summary.byCategory.missingData++;
+        }
         // 5. KEIN ANBIETER/TARIF
         if (!contract.providerId && !contract.providerName) {
             issues.push({

backend/dist/services/customer.service.d.ts

@@ -180,8 +180,12 @@ export declare function getCustomerById(id: number): Promise<({
         cancellationPeriodId: number | null;
         contractDurationId: number | null;
         previousContractId: number | null;
+        previousProviderId: number | null;
+        previousCustomerNumber: string | null;
+        previousContractNumber: string | null;
         providerId: number | null;
         tariffId: number | null;
+        contractNumberAtProvider: string | null;
         priceFirst12Months: string | null;
         priceFrom13Months: string | null;
         priceAfter24Months: string | null;

backend/node_modules/.prisma/client/index-browser.js

@@ -412,11 +412,15 @@ exports.Prisma.ContractScalarFieldEnum = {
   cancellationPeriodId: 'cancellationPeriodId',
   contractDurationId: 'contractDurationId',
   previousContractId: 'previousContractId',
+  previousProviderId: 'previousProviderId',
+  previousCustomerNumber: 'previousCustomerNumber',
+  previousContractNumber: 'previousContractNumber',
   providerId: 'providerId',
   tariffId: 'tariffId',
   providerName: 'providerName',
   tariffName: 'tariffName',
   customerNumberAtProvider: 'customerNumberAtProvider',
+  contractNumberAtProvider: 'contractNumberAtProvider',
   priceFirst12Months: 'priceFirst12Months',
   priceFrom13Months: 'priceFrom13Months',
   priceAfter24Months: 'priceAfter24Months',

backend/node_modules/.prisma/client/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "prisma-client-05071f627540060c098bd6f9ad2705f280d372ae8cdaf0576ff7e91f8d0f9863",
+  "name": "prisma-client-ab03eeebd49b41f4edbc7df102e0a7779d814508dbccb860745760460e9e271f",
   "main": "index.js",
   "types": "index.d.ts",
   "browser": "index-browser.js",

backend/node_modules/.prisma/client/schema.prisma

@@ -413,6 +413,7 @@ model Provider {
   isActive          Boolean    @default(true)
   tariffs           Tariff[]
   contracts         Contract[]
+  previousContracts Contract[] @relation("PreviousProvider") // Verträge wo dieser Provider Altanbieter ist
   createdAt         DateTime   @default(now())
   updatedAt         DateTime   @updatedAt
 }
@@ -509,6 +510,12 @@ model Contract {
   previousContract   Contract? @relation("ContractHistory", fields: [previousContractId], references: [id])
   followUpContract   Contract? @relation("ContractHistory")
 
+  // Altanbieter-Daten (nur wenn kein Vorgängervertrag existiert)
+  previousProviderId     Int?
+  previousProvider       Provider? @relation("PreviousProvider", fields: [previousProviderId], references: [id])
+  previousCustomerNumber String? // Kundennummer beim Altanbieter
+  previousContractNumber String? // Vertragsnummer beim Altanbieter
+
   // Anbieter & Tarif (neue Verknüpfung)
   providerId Int?
   provider   Provider? @relation(fields: [providerId], references: [id])
@@ -519,6 +526,7 @@ model Contract {
   providerName             String?
   tariffName               String?
   customerNumberAtProvider String?
+  contractNumberAtProvider String? // Vertragsnummer beim Anbieter
   priceFirst12Months       String? // Preis erste 12 Monate
   priceFrom13Months        String? // Preis ab 13. Monat
   priceAfter24Months       String? // Preis nach 24 Monaten

backend/node_modules/.prisma/client/wasm.js

@@ -412,11 +412,15 @@ exports.Prisma.ContractScalarFieldEnum = {
   cancellationPeriodId: 'cancellationPeriodId',
   contractDurationId: 'contractDurationId',
   previousContractId: 'previousContractId',
+  previousProviderId: 'previousProviderId',
+  previousCustomerNumber: 'previousCustomerNumber',
+  previousContractNumber: 'previousContractNumber',
   providerId: 'providerId',
   tariffId: 'tariffId',
   providerName: 'providerName',
   tariffName: 'tariffName',
   customerNumberAtProvider: 'customerNumberAtProvider',
+  contractNumberAtProvider: 'contractNumberAtProvider',
   priceFirst12Months: 'priceFirst12Months',
   priceFrom13Months: 'priceFrom13Months',
   priceAfter24Months: 'priceAfter24Months',

backend/prisma/migrations/20260208130924_add_contract_number_at_provider/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE `Contract` ADD COLUMN `contractNumberAtProvider` VARCHAR(191) NULL;

backend/prisma/migrations/20260208132553_add_previous_provider_fields/migration.sql

@@ -0,0 +1,7 @@
+-- AlterTable
+ALTER TABLE `Contract` ADD COLUMN `previousContractNumber` VARCHAR(191) NULL,
+    ADD COLUMN `previousCustomerNumber` VARCHAR(191) NULL,
+    ADD COLUMN `previousProviderId` INTEGER NULL;
+
+-- AddForeignKey
+ALTER TABLE `Contract` ADD CONSTRAINT `Contract_previousProviderId_fkey` FOREIGN KEY (`previousProviderId`) REFERENCES `Provider`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;

backend/prisma/schema.prisma

@@ -413,6 +413,7 @@ model Provider {
   isActive            Boolean    @default(true)
   tariffs             Tariff[]
   contracts           Contract[]
+  previousContracts   Contract[] @relation("PreviousProvider")  // Verträge wo dieser Provider Altanbieter ist
   createdAt           DateTime   @default(now())
   updatedAt           DateTime   @updatedAt
 }
@@ -509,6 +510,12 @@ model Contract {
   previousContract        Contract?       @relation("ContractHistory", fields: [previousContractId], references: [id])
   followUpContract        Contract?       @relation("ContractHistory")
 
+  // Altanbieter-Daten (nur wenn kein Vorgängervertrag existiert)
+  previousProviderId      Int?
+  previousProvider        Provider?       @relation("PreviousProvider", fields: [previousProviderId], references: [id])
+  previousCustomerNumber  String?         // Kundennummer beim Altanbieter
+  previousContractNumber  String?         // Vertragsnummer beim Altanbieter
+
   // Anbieter & Tarif (neue Verknüpfung)
   providerId              Int?
   provider                Provider?       @relation(fields: [providerId], references: [id])
@@ -519,6 +526,7 @@ model Contract {
   providerName            String?
   tariffName              String?
   customerNumberAtProvider String?
+  contractNumberAtProvider String?         // Vertragsnummer beim Anbieter
   priceFirst12Months      String?         // Preis erste 12 Monate
   priceFrom13Months       String?         // Preis ab 13. Monat
   priceAfter24Months      String?         // Preis nach 24 Monaten

backend/src/services/contract.service.ts

@@ -122,6 +122,7 @@ export async function getContractById(id: number, decryptPassword = false) {
       provider: true,
       tariff: true,
       contractCategory: true,
+      previousProvider: true,
       previousContract: {
         include: {
           energyDetails: { include: { meter: { include: { readings: true } }, invoices: true } },

backend/src/services/contractCockpit.service.ts

@@ -361,6 +361,17 @@ export async function getCockpitData(): Promise<CockpitResult> {
       summary.byCategory.missingData++;
     }
 
+    // 4b. KEINE VERTRAGSNUMMER BEIM ANBIETER
+    if (!contract.contractNumberAtProvider) {
+      issues.push({
+        type: 'missing_contract_number',
+        label: 'Vertragsnummer fehlt',
+        urgency: 'warning',
+        details: 'Vertragsnummer beim Anbieter fehlt',
+      });
+      summary.byCategory.missingData++;
+    }
+
     // 5. KEIN ANBIETER/TARIF
     if (!contract.providerId && !contract.providerName) {
       issues.push({

frontend/dist/index.html

@@ -5,8 +5,8 @@
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>OpenCRM</title>
-    <script type="module" crossorigin src="/assets/index-BUCLPhDH.js"></script>
+    <script type="module" crossorigin src="/assets/index-OTeAOPxR.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-BTfzRMgT.css">
+    <link rel="stylesheet" crossorigin href="/assets/index-B06MVODt.css">
   </head>
   <body>
     <div id="root"></div>

frontend/src/components/contracts/ContractDetailModal.tsx

@@ -105,6 +105,39 @@ export default function ContractDetailModal({ contractId, isOpen, onClose }: Con
                     </dd>
                   </div>
                 )}
+                {c.contractNumberAtProvider && (
+                  <div>
+                    <dt className="text-sm text-gray-500">Vertragsnummer beim Anbieter</dt>
+                    <dd className="font-mono flex items-center gap-1">
+                      {c.contractNumberAtProvider}
+                      <CopyButton value={c.contractNumberAtProvider} />
+                    </dd>
+                  </div>
+                )}
+              </div>
+            </Card>
+          )}
+
+          {/* Zähler (nur bei Strom/Gas) */}
+          {(c.type === 'ELECTRICITY' || c.type === 'GAS') && c.energyDetails?.meter && (
+            <Card title="Zähler">
+              <div className="grid grid-cols-2 gap-4">
+                <div>
+                  <dt className="text-sm text-gray-500">Zählernummer</dt>
+                  <dd className="font-mono flex items-center gap-1">
+                    {c.energyDetails.meter.meterNumber}
+                    <CopyButton value={c.energyDetails.meter.meterNumber} />
+                  </dd>
+                </div>
+                {c.energyDetails.maloId && (
+                  <div>
+                    <dt className="text-sm text-gray-500">MaLo-ID</dt>
+                    <dd className="font-mono flex items-center gap-1">
+                      {c.energyDetails.maloId}
+                      <CopyButton value={c.energyDetails.maloId} />
+                    </dd>
+                  </div>
+                )}
               </div>
             </Card>
           )}

frontend/src/pages/contracts/ContractDetail.tsx

@@ -1569,6 +1569,12 @@ export default function ContractDetail() {
                 <dd className="font-mono">{c.previousContract.customerNumberAtProvider}</dd>
               </div>
             )}
+            {c.previousContract.contractNumberAtProvider && (
+              <div>
+                <dt className="text-sm text-gray-500">Vertragsnummer</dt>
+                <dd className="font-mono">{c.previousContract.contractNumberAtProvider}</dd>
+              </div>
+            )}
             {c.previousContract.portalUsername && (
               <div>
                 <dt className="text-sm text-gray-500">Zugangsdaten</dt>
@@ -1579,6 +1585,38 @@ export default function ContractDetail() {
         </Card>
       )}
 
+      {/* Altanbieter-Info (nur wenn KEIN Vorgängervertrag aber Altanbieter-Daten vorhanden) */}
+      {!c.previousContract && (c.previousProvider || c.previousCustomerNumber || c.previousContractNumber) && (
+        <Card className="mb-6 border-l-4 border-l-gray-400" title="Altanbieter">
+          <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
+            {c.previousProvider && (
+              <div>
+                <dt className="text-sm text-gray-500">Anbieter</dt>
+                <dd>{c.previousProvider.name}</dd>
+              </div>
+            )}
+            {c.previousCustomerNumber && (
+              <div>
+                <dt className="text-sm text-gray-500">Kundennummer</dt>
+                <dd className="font-mono flex items-center gap-1">
+                  {c.previousCustomerNumber}
+                  <CopyButton value={c.previousCustomerNumber} />
+                </dd>
+              </div>
+            )}
+            {c.previousContractNumber && (
+              <div>
+                <dt className="text-sm text-gray-500">Vertragsnummer</dt>
+                <dd className="font-mono flex items-center gap-1">
+                  {c.previousContractNumber}
+                  <CopyButton value={c.previousContractNumber} />
+                </dd>
+              </div>
+            )}
+          </div>
+        </Card>
+      )}
+
       {/* Cancellation Confirmation Warning */}
       {c.cancellationConfirmationDate && (
         <div className="mb-6 p-4 bg-red-50 border-2 border-red-400 rounded-lg flex items-start gap-3">
@@ -1635,6 +1673,15 @@ export default function ContractDetail() {
                 </dd>
               </div>
             )}
+            {c.contractNumberAtProvider && (
+              <div>
+                <dt className="text-sm text-gray-500">Vertragsnummer</dt>
+                <dd className="font-mono flex items-center gap-1">
+                  {c.contractNumberAtProvider}
+                  <CopyButton value={c.contractNumberAtProvider} />
+                </dd>
+              </div>
+            )}
             {c.salesPlatform && (
               <div>
                 <dt className="text-sm text-gray-500">Vertriebsplattform</dt>

frontend/src/pages/contracts/ContractForm.tsx

@@ -77,6 +77,7 @@ export default function ContractForm() {
 
   const contractType = watch('type') as ContractType;
   const customerId = watch('customerId');
+  const previousContractId = watch('previousContractId');
 
   // Fetch existing contract for edit
   const { data: contract } = useQuery({
@@ -255,6 +256,7 @@ export default function ContractForm() {
         providerName: c.providerName || '',
         tariffName: c.tariffName || '',
         customerNumberAtProvider: c.customerNumberAtProvider || '',
+        contractNumberAtProvider: c.contractNumberAtProvider || '',
         priceFirst12Months: c.priceFirst12Months || '',
         priceFrom13Months: c.priceFrom13Months || '',
         priceAfter24Months: c.priceAfter24Months || '',
@@ -273,8 +275,6 @@ export default function ContractForm() {
         basePrice: c.energyDetails?.basePrice || '',
         unitPrice: c.energyDetails?.unitPrice || '',
         bonus: c.energyDetails?.bonus || '',
-        previousProviderName: c.energyDetails?.previousProviderName || '',
-        previousCustomerNumber: c.energyDetails?.previousCustomerNumber || '',
         // Internet details
         downloadSpeed: c.internetDetails?.downloadSpeed || '',
         uploadSpeed: c.internetDetails?.uploadSpeed || '',
@@ -317,6 +317,10 @@ export default function ContractForm() {
         wasSpecialCancellation: c.wasSpecialCancellation || false,
         // Vorgänger-Vertrag
         previousContractId: c.previousContractId?.toString() || '',
+        // Altanbieter (nur wenn kein Vorgängervertrag)
+        previousProviderId: c.previousProviderId?.toString() || '',
+        previousCustomerNumber: c.previousCustomerNumber || '',
+        previousContractNumber: c.previousContractNumber || '',
       });
 
       // Load simCards if available
@@ -473,6 +477,7 @@ export default function ContractForm() {
       providerName: emptyToNull(data.providerName),
       tariffName: emptyToNull(data.tariffName),
       customerNumberAtProvider: emptyToNull(data.customerNumberAtProvider),
+      contractNumberAtProvider: emptyToNull(data.contractNumberAtProvider),
       priceFirst12Months: emptyToNull(data.priceFirst12Months),
       priceFrom13Months: emptyToNull(data.priceFrom13Months),
       priceAfter24Months: emptyToNull(data.priceAfter24Months),
@@ -490,6 +495,10 @@ export default function ContractForm() {
       cancellationConfirmationOptionsDate: data.cancellationConfirmationOptionsDate ? new Date(data.cancellationConfirmationOptionsDate) : null,
       wasSpecialCancellation: data.wasSpecialCancellation || false,
       previousContractId: safeParseInt(data.previousContractId) ?? null,
+      // Altanbieter (nur wenn kein Vorgängervertrag)
+      previousProviderId: data.previousContractId ? null : (safeParseInt(data.previousProviderId) ?? null),
+      previousCustomerNumber: data.previousContractId ? null : emptyToNull(data.previousCustomerNumber),
+      previousContractNumber: data.previousContractId ? null : emptyToNull(data.previousContractNumber),
     };
 
     // Add type-specific details
@@ -502,8 +511,6 @@ export default function ContractForm() {
         basePrice: data.basePrice ? parseFloat(data.basePrice) : null,
         unitPrice: data.unitPrice ? parseFloat(data.unitPrice) : null,
         bonus: data.bonus ? parseFloat(data.bonus) : null,
-        previousProviderName: emptyToNull(data.previousProviderName),
-        previousCustomerNumber: emptyToNull(data.previousCustomerNumber),
       };
     }
 
@@ -710,6 +717,29 @@ export default function ContractForm() {
                 placeholder="Keinen Vorgänger auswählen"
               />
             )}
+
+            {/* Altanbieter-Daten (nur wenn KEIN Vorgängervertrag ausgewählt) */}
+            {customerId && !previousContractId && (
+              <div className="mt-4 p-4 bg-gray-50 rounded-lg border border-gray-200">
+                <h4 className="text-sm font-medium text-gray-700 mb-3">Altanbieter-Daten</h4>
+                <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
+                  <Select
+                    label="Altanbieter"
+                    {...register('previousProviderId')}
+                    options={providers.map((p) => ({ value: p.id, label: p.name }))}
+                    placeholder="Bitte wählen..."
+                  />
+                  <Input
+                    label="Kundennr. beim Altanbieter"
+                    {...register('previousCustomerNumber')}
+                  />
+                  <Input
+                    label="Vertragsnr. beim Altanbieter"
+                    {...register('previousContractNumber')}
+                  />
+                </div>
+              </div>
+            )}
           </div>
         </Card>
 
@@ -775,6 +805,7 @@ export default function ContractForm() {
               disabled={!selectedProviderId}
             />
             <Input label="Kundennummer beim Anbieter" {...register('customerNumberAtProvider')} />
+            <Input label="Vertragsnummer beim Anbieter" {...register('contractNumberAtProvider')} />
             <Input label="Provision (€)" type="number" step="0.01" {...register('commission')} />
             <Input label="Preis erste 12 Monate" {...register('priceFirst12Months')} placeholder="z.B. 29,99 €/Monat" />
             <Input label="Preis ab 13. Monat" {...register('priceFrom13Months')} placeholder="z.B. 39,99 €/Monat" />
@@ -943,8 +974,6 @@ export default function ContractForm() {
                 {...register('unitPrice')}
               />
               <Input label="Bonus (€)" type="number" step="0.01" {...register('bonus')} />
-              <Input label="Vorversorger" {...register('previousProviderName')} />
-              <Input label="Kundennr. beim Vorversorger" {...register('previousCustomerNumber')} />
             </div>
 
             {/* Hinweis für Zählerstände und Rechnungen */}

frontend/src/types/index.ts

@@ -297,6 +297,11 @@ export interface Contract {
   salesPlatform?: SalesPlatform;
   previousContractId?: number;
   previousContract?: Contract;
+  // Altanbieter (nur wenn kein Vorgängervertrag)
+  previousProviderId?: number;
+  previousProvider?: Provider;
+  previousCustomerNumber?: string;
+  previousContractNumber?: string;
   providerId?: number;
   provider?: Provider;
   tariffId?: number;
@@ -308,6 +313,7 @@ export interface Contract {
   providerName?: string;
   tariffName?: string;
   customerNumberAtProvider?: string;
+  contractNumberAtProvider?: string;
   priceFirst12Months?: string;
   priceFrom13Months?: string;
   priceAfter24Months?: string;