Create a functionality to tell the system that you want to ShortPick the full picking Quantity, that there is nothing left from the required SKU in the picking location.

Actually to do so, you have to choose ShortPick - open the details - enter a 0 in Picking Qty - Close the details and Confirm then 3 times on the mobile device. So instead of taking 7 steps in the mobile device it would be nice to create a new functionality to execute one step only.