Can you stop an order future committing

Hello,

Is there a way to stop an order going on future commit if you need it to be hard committed from the time of entry?

Our situation is where we have an order which requires an item with a specific serial number, (we entered the serial into the sales order to reserve it).

The order isn't due to ship until after the commitment days in branch plant constants, so it is future committing.

This leaves the required serial available for other orders to take which we do not want.

Apart from having a separate branch plant, is there a way to avoid the order line going on future commit so it can hard commit the serial making it unavailable for other orders?