UoM conversion factors not identical: predecessor &1 and successor &2

What causes this issue?

Predecessor product &V1& has base unit of measure &V3&. Successor
product &V2& has base unit of measure &V4&. Different conversion factors
have been maintained in the master data of products &V1& and &V2&.

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.