Please help me with following requirement.
I want to raise a Purchase Order for a certain material to a single vendor with a pre-payment of 40% (out of total PO value). How do I make sure that until invoice for the Pre-payment is raised in SAP, that no users can GRN the goods? (Because there will be a time delay between PO being released and finance department making the invoice booking for the vendor for that PO as a advance payment, and I do not want any user to GRN during that time period.)