Defining Payment Blocks 
If you use the payment wizard to automatically issue and create incoming and outgoing payments, there might be cases where you would want to exclude a specific business partner from the payment run. For this purpose you assign a payment block that indicates the reason for the exclusion.
Use the procedure to define the payment blocks.
Procedure
From the SAP Business One Main Menu, choose
Business Partner 
Business Partner Master Data Payment Run 
.Select Payment Blocks.
In the field on the right, choose Define New.
The Payment Blocks – Setup window appears.
In the Payment Block field, enter a description of the payment block reason.
Choose Update.
NoteThe list is updated after each row entry.
End of the note.