Valid from date &1 of assignment must not lie before the &2

What causes this issue?

The <LB><LS>Valid from</></> date &V1& of the assignment precedes the
<LS>Valid from</> date &V2& of the note to which you want to assign the
material. The earliest start date for an assignment is the date or the
time at which the node is valid when the <LS>Valid from</> date of the
node is in the future.

System Response

The system cannot transfer the entered assignment.

How to fix this error?

Adjust the <LS>Valid from</> date of the assignments in such a way that
it begins on &V2& at the earliest.

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.