INVENTORY ISSUE

I AM TRYING TO SAVE A PURCHASE BILL THAT WAS ENTERED INCORRECTLY AND MYOB WILL NOT LET ME SAVE

There's not enough stock on hand. Check if you have enough stock of the items on this supplier return.
Processing this supplier return would leave ........... with a negative on hand quantity and a positive value in inventory. A stock adjustment may be required.

WHAT CAN I DO ?