Valid To & lies in the past

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

If the end of the validity date lies in the past, the system cannot
create or change any follow-up/replacement material relationships.

How to fix this error?

Enter the current date or a date in the future as the end of the
validity period.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.