Original material and follow-up/replacement material & are identical

What causes this issue?

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

System Response

The system does not create any follow-up/replacement material
relationships in which the original material and the
follow-up/replacement material are identical.

How to fix this error?

Select different original and follow-up/replacement materials.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.