Diagnosis
Number range &1 is not defined in partner or customer management.

System Response
Business partner data is not saved.

Procedure
Create the missing number range in Customizing for business partner orcustomer management, and migrate the Customizing of the selectedbusiness partner grouping.
This business partner grouping refers either to a non-existent businesspartner number range or to a customer account group that was notassigned an existing number range.