Message SAP /BON/AG_MNT011 - Partner function 'payer' not maintained for business partner &1

Diagnosis
A rebate recipient for the rebate agreement could not be found forbusiness partner &V1&. The Business Add-In (BAdI) has probably returnedan error.

System Response
The system does not create a rebate agreement.

Procedure
Check the BAdI for determining the rebate recipient.