Hi GS,
This error is due to that you are trying to confirm the operation by using two confirmation methods (time ticket-CO11N & Time Event-CO19). You can able to use any any one of the method for your order operation confirmation.For example, your order have 3 operations, you confirmed your first operation through CO11N and if you try to confirm the second operation through CO19 then system won't allow to do this. You can use all of your operations in order by either CO11N or CO19. Please check it and revert back.
Thanks