3593025 - Data Workbench Update Issue: Main Indicator Changes Not Reflecting in UI for Account Contact Persons

After successfully updating the "Main Indicator" from "TRUE" to "FALSE" for Account Contact Persons via the Data Workbench (DWB), the changes do not reflect in the user interface (UI).
Despite the update being completed without errors in the Excel file, no changes appear in the system, and the UI still displays the old values. This indicates that the update process did not properly sync with the system's UI, leaving the data unchanged from the user's perspective.

SAP Cloud for Customer

1. Open the Data Workbench (DWB) tool.
2. Select the Account Contact Persons object for updating.
3. Upload the file containing the changes to the Main Indicator (set the value to "TRUE" or "FALSE").
4. Complete the update process successfully.
5. After the update, check the Account Contact Persons object in the UI.
6. The value of the Main Indicator is not reflected in the UI, and no changes are visible.

The issue arises when an account contains only one existing contact. The system is designed to flag this single contact as the "main contact," which is a requirement in all business processes. Hence is not possible to update from TRUE to FALSE via Data Workbench. 

For accounts with only one contact, the system should automatically designate this contact as the "main contact" since no other options are available. This is expected by the system design. 
In cases where there are multiple contacts, the main contact flag can be removed, allowing flexibility for users to manually designate a main contact or leave it undefined. This ensures clarity and aligns with business processes.

Data Workbench (DWB); Main Indicator; Account Contact Persons; UI Sync Issue; System Update; Data Update Process; Contact Flag; Excel File Upload; Account Management; System Design; Main Contact Flag; User Interface Issue; Multiple Contacts; Business Processes , KBA , LOD-LE-BP-BP , Business Partner , Product Enhancement