Batch Invoicing

I cannot believe on a modern day inventory system, there is no functionality to batch invoice. We have several suppliers whom deliver then invoice at the end of the month. The issue is that multiple receipt lines are created on the PO when booking in using the WMS, but then we are unable to match an invoice to these multiple receipts. Other systems i've used have this as a standard function; enter a bill then allocate the PO(s) and/or receipting lines. Why not Cin7 :(