How To Fix CNV_20900239 - Old/New vendor number existence and Implicit merge check:

CNV_20900239 - Overview

• Message type: E = Error

• Message class: CNV_20900 - Message class for package CNV_20900

• Message number: 239

• Message text: Old/New vendor number existence and Implicit merge check:

What causes this issue?

# Existence Check:
All the vendor numbers (old value) which are maintained in the mapping
should exist in the table LFA1, otherwise will result in error message.
Also, the maintained new vendor numbers should not exist in master table
LFA1, if exists then you can see a warning message.
# Implicit Merge:
If old vendor number is mapped to an already existing vendor number.
For example: If A >B and B already exists
If you want to convert vendor number A->B and B already exists in the
table LFA1, then:
In a 1:1 conversion, this is not allowed that source is changed into
target and target itself is not getting changed: Error message.
In an N: 1 conversion, you should check if you want the existing vendor
record to be overwritten: Warning message.

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_20900239 - Details

• The SAP error message CNV_20900239 typically occurs during data migration processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is a conflict between old and new vendor numbers during the migration process, specifically related to the existence of vendor numbers that are being merged or updated.
  
  Cause:
  
  
  Duplicate Vendor Numbers: The error arises when the migration process detects that both the old and new vendor numbers exist in the system. This can happen if:
  
  The old vendor number is still active in the system.
  The new vendor number is already assigned to another vendor.
  
  
  
  Implicit Merge Check: The implicit merge check is a validation step that ensures that the old and new vendor numbers do not conflict. If both numbers exist, the system cannot proceed with the migration.
  
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Vendor Numbers:
  
  Verify if the old vendor number is still active in