3371670 - Error: "At least one Customer Role required to maintain Additional Information" upon trying to extend an existing supplier as customer

When using the Manage Customer Master Data app, attempting to extend an existing supplier as a customer results in the following error:

"At least one Customer Role required to maintain Additional Information"

However, it is possible to extend an existing customer as a supplier with the Manage Supplier Master Data app. Further, with the apps Maintain Business Partner/Manage Business Partner Master Data there are no issues.

SAP S/4HANA Cloud Public Edition

1. Go to the Manage Customer Master Data app
2. Select the Business partner which has roles supplier (FLVN01) & supplier (Fin.Accounting - FLVN00) 
3. Open the business partner
4. Navigate to the roles tab
5. Create a new Role as customer (FLCU01) or customer (Fin.Accounting - FLCU00)
6. Save your changes
7. System throws the error message "At least one Customer Role required to maintain Additional Information"

This is the designed behavior. The Manage Customer Master Data app is specifically designed for creating new customers or updating existing ones. As a result, SAP has pre-selected the customer role when the app loads. This app is not meant for managing other business partner-specific roles. Therefore, use the Manage Customer Master Data app exclusively for creating and updating customers. 

Use the Manage Business Partner Master Data app to extend an existing supplier as a customer.

Previously, when extending an existing customer as a supplier using the Manage Supplier Master Data app, certain validation checks were missing in the Manage Customer Master Data app. As a result, the process worked without errors. These checks have now been implemented. However, similar checks are still missing in the Manage Supplier Master Data app, which is why the process continues to work there. This issue is planned to be fixed in the further releases.

Manage Customer Master Data, Supplier, Customer, Manage Business Partner Master Data, Maintain Business Partner, Manage Supplier Master Data, Additional Information, Customer Role, Extend , KBA , LO-MD-BP-2CL , Business Partners for Public Cloud , LO-MD-BP , Business Partners , Problem