Valid From & is later than "Valid To &"

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 period lies before its start, the system does
not create or change any follow-up/replacement material relationships.

How to fix this error?

INCLUDE ISR_CHECK

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.