Want to generate one invoice per waybill using grouping rules - does not work when customer PO numbe

 Hi,

We are using release 11.5.10.2 and one of our customer requirements is to send 1 invoice per day, per customer, per waybill.  We have set up a grouping rule that groups on interface_line_attribute4 (waybill) and this is working fine in some cases.  However, when the customer purchase order is different on the sales orders then the grouping rule does not work.  I have found note id 820854.1 where it states that oe_order_lines_all.cust_po_number is a mandatory grouping column which cannot be excluded from the grouping rules - however this states it is for R12 and I wondered if anyone has had