Diagnosis
Two or more external product tax groups have been assigned to oneinternal product tax group.

System Response

Procedure
In Customizing for the TTE:
Choose Assign Objects From External Systems
Select the relevant external system: System ID1 &V3&, andTax Type Assignment for tax type &V2&.
Select Product Tax Group Key Assignment.
Adjust the assignments so that each external tax group has a uniqueassignment to an internal tax group.
Save your entries.
For an immediate Customizing update, executeImmediate Customizing Refresh.