Sales period begins in the past

What causes this issue?

The sales period of the promotion to be imported begins in the past.

System Response

The promotion is not imported.

How to fix this error?

Change the sales period of the promotion so that it does not begin in
the past.

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.