Canceling of Order Confirmations in ABAP List-Based PI Sheets 
Use
There are two ways in which you can create an order confirmation from within the PI sheet:
If you have entered a confirmation and you notice that the data confirmed is incorrect, you can cancel the data from within the PI sheet.
For information about how to access the cancel function, see
Canceling Order Confirmations Within ABAP List-Based PI Sheets.Features
To carry out the function, you need to proceed in the same way as when you cancel a confirmation within order maintenance; see
How to Cancel a Completion Confirmation.