diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb5821fc..68e73709 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Improved the _Select all_ activities checkbox state after importing activities including a duplicate
+- Fixed an issue with the data source transformation in the import dividends dialog
 - Fixed the _Storybook_ setup
 
 ## 1.269.0 - 2023-05-11
diff --git a/apps/api/src/app/import/import.controller.ts b/apps/api/src/app/import/import.controller.ts
index 289d103e..9fbc8075 100644
--- a/apps/api/src/app/import/import.controller.ts
+++ b/apps/api/src/app/import/import.controller.ts
@@ -35,6 +35,8 @@ export class ImportController {
 
   @Post()
   @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInRequestInterceptor)
+  @UseInterceptors(TransformDataSourceInResponseInterceptor)
   public async import(
     @Body() importData: ImportDataDto,
     @Query('dryRun') isDryRun?: boolean
diff --git a/apps/api/src/interceptors/transform-data-source-in-request.interceptor.ts b/apps/api/src/interceptors/transform-data-source-in-request.interceptor.ts
index 6b75a561..ad257963 100644
--- a/apps/api/src/interceptors/transform-data-source-in-request.interceptor.ts
+++ b/apps/api/src/interceptors/transform-data-source-in-request.interceptor.ts
@@ -6,6 +6,7 @@ import {
   Injectable,
   NestInterceptor
 } from '@nestjs/common';
+import { DataSource } from '@prisma/client';
 import { Observable } from 'rxjs';
 
 @Injectable()
@@ -24,11 +25,24 @@ export class TransformDataSourceInRequestInterceptor<T>
     const request = http.getRequest();
 
     if (this.configurationService.get('ENABLE_FEATURE_SUBSCRIPTION')) {
-      if (request.body.dataSource) {
+      if (request.body.activities) {
+        request.body.activities = request.body.activities.map((activity) => {
+          if (DataSource[activity.dataSource]) {
+            return activity;
+          } else {
+            return {
+              ...activity,
+              dataSource: decodeDataSource(activity.dataSource)
+            };
+          }
+        });
+      }
+
+      if (request.body.dataSource && !DataSource[request.body.dataSource]) {
         request.body.dataSource = decodeDataSource(request.body.dataSource);
       }
 
-      if (request.params.dataSource) {
+      if (request.params.dataSource && !DataSource[request.params.dataSource]) {
         request.params.dataSource = decodeDataSource(request.params.dataSource);
       }
     }