Hello,
The issue is generally caused if the BP has addresses with the ADR_KIND AS XXDEFAULT and all
with same validity. Overlapping of the validity for teh standard address i.e ADDR_KIND is not allowed. Please check BUT021_FS table.
In the target system, the BP may have multiple XXDEFAULT for the same time period in BUT021_FS.
The XXDEFAULT concept is that at a given point of time only one address can XXDEFAULT( standard) address.
Thanks & regards,
Sonal