Diagnosis
An error has occured when selecting the payment method for the currentflow record. Either the payment method you specified does not exist orthe type of payment method is not compatible with the activity categoryof the flow in question.

Procedure
Check whether the payment method has been assigned to the businesspartner. To do this, you can branch to the relevant contract for thebusiness operation using the button Display Contract. Here youcan have the system display the payment methods assigned to thebusiness partner in the Partner Data.
If there is no payment method permitted for the payment of the businessoperation assigned to the business partner, cancel the processing ofthe business operation and add the missing payment method to thepartner data. You can then enter the business operation with thepayment method required.
Check also whether the activity category for the flow (debit postition,for example) is compatible with the payment method. (A payment methodfor incoming payments is needed for the activity category debitpostition.)