To have payment notices created automatically for a customer, you have to select either Cust. (with CI) or Cust. (w/o CI) in the company-code area of the customer master record. The system will then request a payment notice for each payment transaction posted to this customer account

If you select Cust. (with CI), the system creates a payment notice which lists the cleared line items.

If you select Cust. (w/o CI), the system creates a payment notice without line items.