SAP Message VK182 - Validity period &1 cannot start before the rebate becomes valid &2

Diagnosis
The validity start date &V1& of the condition record is before thevalidity start date &V2& of the assignedagreement &V3&.
The validity period of a condition record has to be within the validityperiod of the assigned agreement, however.

System Response
You cannot enter the validity start date.

Procedure
Select a validity start date that is later than the validity start dateV2 of the agreement or identical with that date.