Currently we have no idea in the vendor payment proposal what is the total amount for the generated proposal.

Mostly often, the payment proposal is allocated to a bank account according to the amount of the payment proposal. In the current proposal, we cannot evaluate this total amount, so we are not able to allocate the corresponding company bank account (it is a classical treasury business process in a payment).

So the requirement is to add at minimum a total amount by currency (proposal can be multi currencies).