Add Ability to Partial pay invoices in closed financial periods

At the moment when you attempt to Partially pay an invoice which is dated in a closed period you will receive an error. The error occurs because partially paying an invoice creates a second invoice with the same ID plus a -1 and since its trying to create it in a closed period it fails. The user and Jim Kerr said you can do that same interaction in Legacy but in AgilLink it seems to be a problem