How To Fix CNV_20900200 - Vendor &1 (to be converted) is already mapped to another value: &3

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20900 - Message class for package CNV_20900

• Message number: 200

• Message text: Vendor &1 (to be converted) is already mapped to another value: &3

What causes this issue?

Your mapping table contains the following entry:
&V1& -> &V3&
However Vendor &V1& is also mapped to the vendor &V2&.

System Response

The row will not be transferred.

How to fix this error?

Check your mapping and decide to which value you want to map &V1&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20900200 - Vendor &1 (to be converted) is already mapped to another value: &3 ?

  The SAP error message CNV_20900200 indicates that during a data conversion process, a vendor (identified by the placeholder &1) is already mapped to another value (identified by &3). This typically occurs in the context of data migration or conversion projects, particularly when using SAP's Conversion Tools or during the migration of vendor data from one system to another.
  Cause:
  
  Duplicate Mapping: The vendor in question is already associated with a different value in the mapping table. This can happen if there are multiple entries for the same vendor in the source data or if there are conflicting mappings in the conversion settings.
  Data Integrity Issues: There may be inconsistencies in the source data, such as duplicate vendor IDs or incorrect mappings that lead to conflicts during the conversion process.
  Configuration Errors: Incorrect configuration in the mapping settings or conversion rules can lead to this error.
  
  Solution:
  
  Check Mapping Table: Review the mapping table to identify where the vendor &1 is already mapped to &3. Ensure that there are no conflicting entries for the same vendor.
  Resolve Duplicates: If there are duplicate entries for the vendor in the source data, decide which entry should be retained and remove or adjust the others to avoid conflicts.
  Adjust Mapping Rules: If the mapping rules are incorrectly set up, modify them to ensure that each vendor is uniquely mapped to a single value.
  Data Cleansing: Perform data cleansing on the source data to eliminate duplicates and ensure that all vendor entries are unique and correctly formatted.
  Consult Documentation: Refer to SAP documentation or guides related to the specific conversion tool you are using for additional troubleshooting steps and best practices.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling vendor mapping issues.
  Transaction Codes: Familiarize yourself with transaction codes related to data migration, such as LTMC (Legacy Transfer Migration Cockpit) or LTMOM (Migration Object Modeler), which may help in managing the mapping process.
  Testing: After making adjustments, conduct thorough testing to ensure that the changes resolve the error and that the data conversion proceeds without further issues.
  
  By following these steps, you should be able to resolve the CNV_20900200 error and successfully complete the vendor data conversion process.