How To Fix CA_TTE585 - 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: 585

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

What causes this issue?

The system always checks if a accounting key 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 TTE 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: systemID1 &V2& systemID2 &V3&.
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</>.

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CA_TTE585 - Reverse mapping not possible due to ambiguous external value ?

  The SAP error message CA_TTE585, which states "Reverse mapping not possible due to ambiguous external value," typically occurs in the context of data transfer or mapping processes, particularly when dealing with external values that do not have a clear or unique mapping to internal values in the SAP system.
  Cause:
  The error is usually caused by one of the following issues:
  
  
  Ambiguous External Values: The external value being processed does not uniquely correspond to a single internal value. For example, if multiple internal records can match the same external value, the system cannot determine which internal record to use.
  
  
  Data Quality Issues: There may be inconsistencies or duplicates in the external data that lead to ambiguity.
  
  
  Configuration Issues: The mapping configuration between external and internal values may not be set up correctly, leading to multiple potential matches.
  
  
  Solution:
  To resolve the CA_TTE585 error, you can take the following steps:
  
  
  Check External Values: Review the external values being processed to ensure they are unique and correctly formatted. Look for duplicates or inconsistencies.
  
  
  Review Mapping Configuration: Check the mapping configuration in the SAP system to ensure that it is set up correctly. Make sure that each external value has a clear and unique mapping to an internal value.
  
  
  Data Cleansing: If the external data contains duplicates or errors, consider cleansing the data before processing it in SAP. This may involve removing duplicates or correcting any inconsistencies.
  
  
  Enhance Mapping Logic: If necessary, enhance the mapping logic to handle cases where multiple internal values could correspond to a single external value. This may involve adding additional criteria to narrow down the mapping.
  
  
  Consult Documentation: Refer to SAP documentation or support resources for specific guidance related to the data transfer or mapping process you are working with.
  
  
  Testing: After making changes, test the mapping process with a small set of data to ensure that the issue is resolved before processing larger datasets.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Transaction Codes: Familiarize yourself with transaction codes related to data mapping and transfer, such as LSMW (Legacy System Migration Workbench) or others relevant to your specific scenario.
  Community Forums: Consider reaching out to SAP community forums or support channels for additional insights or similar experiences from other users.
  
  By following these steps, you should be able to identify the root cause of the CA_TTE585 error and implement a solution to resolve it.