As we import credit card statements, we cannot match Purchase Orders created for Purchase Orders, so the invoice and PO isn't linked, and it comes up as a warning on our VAT Return (POs marked as delivered and not invoiced). There's no way to link the invoice to the PO or delete the warnings, the warning comes up every quarter and just increases. There should be a way to manually link a posted invoice to the PO, rather than having to delete the transaction and repost it!