Packaging Slip Incorrect


We have a company that requires a packaging slip, there is a problem with this though.

Let's say, a customer orders 200 products but we have 100 in stock.

We create a detailed shipment and send the first 100 products to the client, then we print a packaging slip.

The packaging slip however will state 200 products, which is incorrect and should show 100 products for the current shipment.

Is there a way to fix this?