How to make item qty to zero on approved PO

HI

IN R12.1.3 we have  below business requirement.

PO  is in APPROVED  Status with 4 items

We sent to the supplier

Now  purchase  officer  do not want  first item from 4 items.But rest of  three items need to purchased.

SHe want to print the first item with zero quantity on PO .

But when trying to edit PO , system not accepting zero qty. ( Error :Enter a positive  value)

Is any way we can print with zero quantity.

Thanks