SAP Message VK312 - Status "Released" already reached by Agreement &

Diagnosis
You wanted to give Status 'B' (Released for settlement) to Rebateagreement &V1&. The rebate agreement, however, already has Status &V2&.Status "Released for settlement" has already been reached.

System Response
The status of Rebate agreement &V1& is not changed.

Procedure
Check whether you have selected the correct rebate agreement.