For an operation you have entered
In total, therefore, you have already confirmed 100 pieces for the operation.
You notice that you have forgotten to confirm 2 pieces of scrap and cancel the final confirmation of 20 pieces.
The system sets the confirmed operation quantity back to 80 pieces and the confirmation status in the operation back to partially confirmed.
Now you can enter a final confirmation with a yield of 18 pieces and a scrap quantity of 2 pieces.