UoM conversion factors not maintained: product &1 from unit &2 to &4

What causes this issue?

Predecessor product &V1& has base unit of measure &V2&. Successor
product &V3& has base unit of measure &V4&. Even though these products
have different base units of measure, conversion factors have not been
maintained in the master data of product &V1&.

System Response

Processing aborted.

How to fix this error?

Maintain the conversion factors in the master data of product &V1&.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.