task due date and milestone due date

[Aamir]

I can add a task which has due date even after due date of  milestone completion. why?

The due date for the task should not be after the milestone duedate
(if some one used M$. Pr0ject, they hav seen that assigning task with due date after due date for milestones is not allowed.)

[xtg]

OG is not a tool for scheduling tasks at first but a tool for documentation of the real work on tasks. You know that the scheduling of tasks and the realising of them often is getting a gap and getting still the necessity to get a reckoning. - Your problem seems for me looking like a candidate for a global setting.