Currently, you cannot use Allocation Accounts in Payment Reconciliation Journals. You are able to select it, but it errors saying you cannot use it on payment rec journals. This is a gap. It would be beneficial to allocate a line to various accounts. The workaround needed is to process the allocation outside of the payment rec journal, such as on a general journal, then go back into either the payment rec journal or the bank rec and match a line to that posted entry. This causes unnecessary added steps.