Can we restrict quantity restriction while receiving

I've a requirement to receive ( PO receipt in RF gun) material in 2 digits only regardless if PO has higher quantity approved for receiving. For a work around i have done a bar code of the fixed quantity to be received that users can scan and receive but issue comes when they don't scan and receive 3 digit numbers. My shipment has fixed 81pc per shipment.

So , Is there a way i can default quantiy field or restrict the quantity to 2 digits.

-SM