Hi Sebastian,
I start with this part.
This remittance advice explains one payment and all the invoices, which are paid. (For the payments initiated by the company, a payment advice is e.g. sent, if the payment reference is too short to explain, what invoices were all paid. For the foreign initiated side it is the same. Someone pays 6 invoice together and applies deductions for some invoices - this will not be available in the note to payee in the bank statement item. So you get an advice, enter it to the system and clear the items from the advice. Then the bank statement confirms the advice and no rework is needed. If you manage to get the advice in an electronic way and upload it and trigger the clearing of the items -> save time.
Even better it will be, if your customer has a central payer, that pays items from various business partners in one payment (we have customers with 200+ items and 10 business partners in one advice). If you have the advice upload, the clearing happens on all TRP Accounts effected. Then again the bank statement comes and confirms the one payment and you are done.
So the idea for the remittence or payment advice: One Payment in the Bank Statement gets explained with an advice.
When your usecase is different, maybe you should drop me an email and we can have a telco.
Best regards
Marlene