How To Fix CNV_20306_CHECK017 - Double mapping entry provided for source COAr &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20306_CHECK - Message Class for package CNV_20306_CHECK

• Message number: 017

• Message text: Double mapping entry provided for source COAr &1

What causes this issue?

A source mapping value is assigned to multiple target values. To run
the transformation solution, all source mapping values must have exactly
one target value.
You cannot run the transformation solution because certain prerequisites
have not been met. Please change your mapping accordingly.

System Response

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

How to fix this error?

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 CNV_20306_CHECK017 - Double mapping entry provided for source COAr &1 ?

  The SAP error message CNV_20306_CHECK017 indicates that there is a double mapping entry for the source COAr (Cost Object Area) in the context of a data migration or conversion process, typically related to the SAP S/4HANA migration or similar projects. This error usually arises during the mapping of source data to target structures, where the same source entry is being mapped to multiple target entries, which is not allowed.
  Cause:
  
  Duplicate Entries: The primary cause of this error is the presence of duplicate mapping entries in the mapping table or configuration. This can happen if the same source COAr is defined multiple times with different target mappings.
  Incorrect Configuration: There may be an error in the configuration of the mapping settings, leading to the same source being mapped to different targets.
  Data Integrity Issues: The source data may have integrity issues, such as duplicates or inconsistencies, that lead to multiple mappings being created.
  
  Solution:
  
  Review Mapping Configuration: Check the mapping configuration for the source COAr. Ensure that each source entry is mapped to a unique target entry. Remove or correct any duplicate mappings.
  Data Cleansing: If the source data contains duplicates, perform data cleansing to ensure that each source COAr is unique before the mapping process.
  Adjust Mapping Logic: If the mapping logic is complex, consider revising it to ensure that it handles duplicates appropriately, possibly by consolidating entries or defining clear rules for mapping.
  Consult Documentation: Refer to the SAP documentation or migration guides related to your specific project to ensure that you are following the recommended practices for mapping.
  Testing: After making changes, conduct thorough testing to ensure that the mapping works as expected and that the error does not reoccur.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error.
  Migration Cockpit: If you are using the SAP S/4HANA Migration Cockpit, review the migration settings and mapping templates provided by SAP.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed, and solutions shared by other users.
  
  By addressing the root cause of the double mapping entry, you should be able to resolve the CNV_20306_CHECK017 error and proceed with your data migration or conversion process.