Be able to receive more than 1 invoice on a Purchase order So you don't have to post a batch and then make a new one
Allow more than one invoice on a purchase order so you don't have to post and keep making more batches. sometimes I have 3 batches with 1 item
Allow multiple invoices for a single PO while Receiving PO's. Sometimes shipments get split and therefore multiple invoices are generated to close out the balance on a single purchase order. It is less efficient to have to post a batch and then re-enter Receiving transactions in the PO module.