How To Fix CNV_20900012 - Vendor &2 already exists in the system; see long text

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20900 - Message class for package CNV_20900

• Message number: 012

• Message text: Vendor &2 already exists in the system; see long text

What causes this issue?

Vendor record &V1& is to be renamed to &V2&. Vendor record &V2& exists
in the system, but is not entered as old value in the mapping table.
This would lead to an <DS:TX.CNV_MBT_IMPLICIT_MERGE>implicit merge</>.
This is not allowed.

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?

If you want to merge &V1& and &V2& to &V2&, enter &V2&, as old value
and as new value in the mapping table and set the priority flag
accordingly. You can set the priority flag either for &V1& or for &V2& .
If you do not want to merge &V1& and &V2&, you can:
Enter a value that does not exist in the master data table for new value
Or
Include &V2& also as old value in the mapping table and enter a
different value for new value.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20900012 - Vendor &2 already exists in the system; see long text ?

  The SAP error message CNV_20900012 indicates that a vendor with the specified identifier (represented by "&2") already exists in the system. This error typically arises during data migration or data upload processes, particularly when using tools like SAP S/4HANA Migration Cockpit or other data transfer methods.
  Cause:
  
  
  Duplicate Vendor Entry: The primary cause of this error is that the vendor you are trying to create or import already exists in the system. This can happen if:
  
  The vendor was previously created manually or through another data upload.
  There is a mismatch in the data being imported, leading to an attempt to create a vendor that already exists.
  
  
  
  Data Migration Issues: During data migration, if the source data contains duplicates or if the mapping is incorrect, it can lead to attempts to create existing vendors.
  
  
  Solution:
  
  
  Check Existing Vendors: 
  
  Use transaction codes like XK03 (Display Vendor) or MK03 (Display Vendor (Purchasing)) to check if the vendor already exists in the system.
  Search for the vendor using the vendor number or other identifying information.
  
  
  
  Data Cleansing:
  
  If you are migrating data, ensure that the source data is cleansed to remove duplicates before attempting to upload it to SAP.
  Verify that the vendor numbers in your source data do not conflict with existing vendor numbers in the SAP system.
  
  
  
  Update Existing Vendor:
  
  If the vendor already exists and you need to update its information, consider using the appropriate transaction (e.g., XK02 for changing vendor data) instead of trying to create a new entry.
  
  
  
  Error Handling in Migration:
  
  If you are using a migration tool, check the mapping and transformation rules to ensure that they are set up correctly to avoid creating duplicates.
  Review the logs generated during the migration process to identify any other potential issues.
  
  
  
  Consult Long Text: 
  
  The error message suggests checking the long text for additional details. You can do this by navigating to the error message in the SAP system and viewing the long text for more context on the error.
  
  
  
  Related Information:
  
  
  Transaction Codes: Familiarize yourself with relevant transaction codes for vendor management, such as:
  
  XK01 - Create Vendor
  XK02 - Change Vendor
  XK03 - Display Vendor
  MK01, MK02, MK03 for purchasing-specific vendor transactions.
  
  
  
  Data Migration Tools: If you are using SAP S/4HANA Migration Cockpit or other data migration tools, refer to the documentation for best practices on handling duplicates and data validation.
  
  
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to vendor creation and data migration.
  
  
  By following these steps, you should be able to resolve the CNV_20900012 error and successfully manage vendor data in your SAP system.