Diagnosis
Two or more business partner tax groups have been assigned to oneinternal business partner tax group.

System Response

Procedure
In Customizing for TTE:
Choose Assign Objects From External Systems
Select the relevant system: system ID1 &V3& , country and tax type &V2&
Adjust the entries so that the internal value &V1& is uniquely assignedto an external business partner tax group.
Choose Save.
For an immediate Customizing update, executeImmediate Customizing Refresh.