When i apply the AP payment to multiple credit notes, Navision won't apply the payment to the selected credit notes. It applies to some random invoices. I contacted our provider and they advise "It's Navision issue and it can only apply to one credit note, but not multiple credit notes. They have designed it this way"

Our provider want to charge us for a modification to allow the payment to be allocated to invoices and multiple credit notes.

I am not impressed with their respond and want to check if it's how Navision designed (can't allocated multiple credit notes). 

Thanks for your help.