[A] Yes production order can be cancelled once created.
[B] To cancel a production order, go to the Production module(1). Under the Production Order tab(2), go to section (3) where that production order is and click on the production order you have to cancel.
[C] After the production order is open, click on Actions(1) and click Cancel(2).
[D] You will be asked for a confirmation. Click Confirm and the order will be cancelled.
Keywords: cancel process, cancel PID