How To Fix CNV_20700021 - New material &2 already exists (implicit merge);see long text

CNV_20700021 - Overview

• Message type: E = Error

• Message class: CNV_20700 - Material number conversion

• Message number: 021

• Message text: New material &2 already exists (implicit merge);see long text

What causes this issue?

Material number &V1& is to be renamed to &V2&. Material number &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.

System Response

How to fix this error?

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.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

CNV_20700021 - Details

• The SAP error message CNV_20700021 indicates that during a data migration or conversion process, a new material with the same identifier already exists in the system. This typically occurs in scenarios where data is being imported or merged, and the system detects a conflict with existing records.
  
  Cause:
  
  Duplicate Material Numbers: The error arises when the system attempts to create a new material that has the same material number as an existing one.
  Implicit Merge: The term "implicit merge" suggests that the system is trying to merge the new material data with the existing one, but it cannot proceed due to the conflict.
  Data Migration Issues: This can happen during data migration projects, especially when consolidating data from multiple sources or systems.
  
  
  Solution:
  
  Check Existing Materials: Verify if the material number already exists in the system. You can do this by searching for the material in the material master (transaction code MM03).
  Adjust Data: If the material