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

CNV_20306_CHECK017 - Overview

• 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.

CNV_20306_CHECK017 - Details

• 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