Hi Pete,
Thanks for your answer.
About the "how else the system knows", well I expect something like "Always respect the order relationship". That in fact is a very common business scenario to ask for. Because, operation 0020 could not start if operation 0010 is finished, therefore to move operation 0020 before 0010 is not correct (at least on my opinion)
Do someone know if there are any other solution ??
Thanks,