When I want to use F110 for automatic payment, I have select one vendor with the same currency, payment method, payment terms, house bank. But when I run the proposal, I see there is a list and it is grouping by differeny payment document number. I want to ask, what is criteria that SAP used to generate different document number for one vendor? Actually there is no different criteria, why SAP generate many payment document number. Please give me some explaination.