Ok, it is clear, but as I said before there is no option to achieve that in SAP. The only solution I can suggest is to develop a custom program that would simplify / automate the creation of payment request. I have implemented similar program on one of my earlier projects.
The program displayed the list of vendor invoices. You were able to select the line and press the button in the application toolbar with the name something like "Create payment request". The program copied the key attributes of the vendor invoice and showed them in the dialog window for end user. The user was able to change some key details e.g. dates, amounts, payment method or item text. Upon confirmation the program generated via BAPI a noted item of the type (partial) payment request. It might not be the ideal solution, but it significantly simplified the data entry efforts on that project. Other than that, you will not find a more suitable solution.
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