SAP Message >4593 - Alternative payer for notifications not supported

Diagnosis
The procedure of debit memo notification is activated for the companycode.
Entering an alternative payer is not supported when generatingnotifications and with the payment of items in the payment run. Thismeans that the items that are paid using a payment method of the typenotification are always notified to the business partner to whichthey were posted and are also always paid using this business partner.
An alternative payer can be entered for items that should be paid withother payment methods.
It is also possible to enter an alternative paying contract account(another contract account of the same business partner) fornotified items.