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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CA_TTE603 - Reverse mapping not possible due to ambiguous external value ?

  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 steps:
  
  
  Check Mapping Configuration:
  
  Review the mapping configuration in the relevant transaction (e.g., transaction codes like TTE or TTE_MAINT).
  Ensure that each external value is uniquely mapped to a single internal value.
  
  
  
  Data Validation:
  
  Validate the external data being processed to ensure there are no duplicates or inconsistencies.
  Clean up the data to ensure that each external value corresponds to only one internal value.
  
  
  
  Adjust Mapping Logic:
  
  If necessary, adjust the logic used for mapping external values to internal values to handle cases where ambiguity might arise.
  Consider implementing additional rules or criteria to resolve ambiguities.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific module or functionality you are working with for any additional guidance or known issues.
  
  
  
  Testing:
  
  After making changes, conduct thorough testing to ensure that the issue is resolved and that the mapping works as expected.
  
  
  
  Seek Support:
  
  If the issue persists, consider reaching out to SAP support or consulting with an SAP expert who can provide more tailored assistance based on your specific configuration and data.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Transaction Codes: Familiarize yourself with transaction codes related to data mapping and transfer, such as TTE, TTE_MAINT, or others relevant to your specific SAP module.
  Data Governance: Implement data governance practices to maintain data quality and prevent similar issues in the future.
  
  By following these steps, you should be able to identify the root cause of the CA_TTE603 error and implement a solution to resolve it.