Adding the BP Reference Number (from the AR Invoice Screen) to the Incoming Payment Screen.
Banking > Incoming Payments
Once on the Incoming Payments screen, click the Form Settings then check BP Reference Number check-box under General tab in the Form Settings – Incoming Payments Screen. Please refer the below screen shot for the same.
JFYI, as per SAP standard if we check the BP Reference Number in the Form Settings screen, Document No. column will not display in the Incoming Payments screen.