Diagnosis
The system always checks if a tax code can be mapped based on anexternal object assignment. If 2 or more external assignments exists for1 internal value, a error message is written to the TTT trace log.

System Response
Processing terminated.

Procedure
If an external tax code should be mapped, proceed as follows:
Call activity: Assign Objects From ExternalSystems (Cross-Application Components -> Transaction Tax Engine ->Utilities -> Assign Objects From External Systems)
Select the relevant system: country &V2&, systemID1 &V3&, systemID2 &V4&
.
Check that the TTE internal value &V1& has a unique relation with theexternal value.
Save your entries.
Refresh customizing immediately with the activityImmediate Customizing Refresh.