Diagnosis
Two or more external product key assignments have been assigned to oneinternal product key assignment.

System Response

Procedure
In Customizing for TTE
Choose Assign Objects From External Systems
Select the relevant external system: System ID1 &V3&, and ProductKey Assignment.
Adjust the assignments so that each external tax group has a uniqueassignment to an internal tax group.
Choose Save.
For an immediate Customizing update, executeImmediate Customizing Refresh.