Receiving Zero Quantity @ Subinventory or Warehourse

Experts,

Client has a requirement to allow receipt of 0 quantity against a PO while receiving. The reason is they have many cases where the some items shipped by vendors are not physically received. Now, they want a flexibility to receive 0 quantity for those items that were not received and go thru the receive and other processes for the invoice and shipping docs. Otherwise, customer has to hold the receiving process for all and co-ordinate outside the system to get the materials or send back the invoice for correction. This seems to be a tedious process. So they want a