How To Fix CNV_20900228 - Duplicate vendor number check:

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20900 - Message class for package CNV_20900

• Message number: 228

• Message text: Duplicate vendor number check:

What causes this issue?

This check is performed on the old vendor numbers maintained in mapping.
If two records maintained with the same old vendor number in mapping,
then you can see an error message in the logs. For example: A -> B and A
-> C maintained in mapping This scenario is not supported by this
Package.

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_20900228 - Duplicate vendor number check: ?

  The SAP error message CNV_20900228 typically indicates that there is a duplicate vendor number in the system during a data migration or conversion process. This error is often encountered when using SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data transfer methods.
  Cause:
  The error occurs when the system detects that the vendor number being processed already exists in the target system. This can happen due to:
  
  Duplicate entries in the source data.
  Incorrect mapping of vendor numbers during the migration process.
  Existing vendor records in the target system that conflict with the incoming data.
  
  Solution:
  To resolve the CNV_20900228 error, you can take the following steps:
  
  
  Identify Duplicates:
  
  Check the source data for duplicate vendor numbers. You can use tools like Excel or SQL queries to identify any duplicates in the source dataset.
  
  
  
  Review Existing Vendors:
  
  In the target SAP system, check if the vendor number already exists. You can do this by using transaction codes like XK03 (Display Vendor) or MK03 (Display Vendor (Purchasing)).
  
  
  
  Adjust Mapping:
  
  If the vendor numbers in the source data are meant to be unique but are conflicting with existing records, consider adjusting the mapping or transformation rules to ensure that the vendor numbers are unique.
  
  
  
  Merge or Delete Duplicates:
  
  If duplicates are found in the source data, decide whether to merge them into a single record or delete the unnecessary duplicates before migration.
  
  
  
  Use a Different Vendor Number:
  
  If the vendor number is not critical, consider using a different vendor number for the new records being migrated.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation related to the specific migration tool you are using for any additional guidelines or best practices regarding vendor number handling.
  
  
  
  Testing:
  
  After making the necessary adjustments, perform a test migration to ensure that the error does not occur again.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as XK01 (Create Vendor), XK02 (Change Vendor), and XK03 (Display Vendor) for managing vendor records.
  Data Migration Tools: Understand the specific data migration tool you are using, as each may have its own set of rules and configurations for handling vendor data.
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  
  By following these steps, you should be able to resolve the CNV_20900228 error and successfully complete your data migration process.