Creating One AR Invoice Per PO Received

I've had a request from one of our offices that I don't think is out of the box Oralce.  They have a customer who would like to only receive one invoice per their purchase order.  I thought maybe consolidated billing could accomplish this but it looks more like a statement to me.  I know we can create grouping rules where we can have one invoice to consolidate shipments from different orgs.  Does anyone else have this requirement and if so how did you accomplish it?