How To Fix CA_TTE603 - Reverse mapping not possible due to ambiguous external value

CA_TTE603 - Overview

• Message type: E = Error

• Message class: CA_TTE - TTE Messages

• Message number: 603

• Message text: Reverse mapping not possible due to ambiguous external value

What causes this issue?

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

System Response

Processing terminated.

How to fix this error?

If an external tax code should be mapped, proceed as follows:
Call activity: <DS:SIMG.SIMGMAP_PARTNER>Assign Objects From External
Systems</> (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 the
external value.
Save your entries.
Refresh customizing immediately with the activity
<DS:SIMG.SIMG_REFRESH>Immediate Customizing Refresh</>.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

CA_TTE603 - Details

• The SAP error message CA_TTE603: Reverse mapping not possible due to ambiguous external value typically occurs in the context of the SAP system's handling of external values and their mapping to internal values, particularly in the area of data transfer or integration scenarios.
  
  Cause:
  This error arises when the system encounters an external value that could correspond to multiple internal values. This ambiguity prevents the system from determining which internal value should be used for the mapping, leading to the error message.
  Possible Causes Include:
  
  Duplicate External Values: The external value being processed is not unique and maps to multiple internal values in the system.
  
  Configuration Issues: There may be issues in the configuration of the mapping tables or settings that define how external values relate to internal values.
  Data Quality Issues: The data being imported or processed may contain inconsistencies or duplicates that lead to ambiguity.
  
  
  Solution:
  To resolve the CA_TTE603 error, you can take the following