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Hi !
I create one projet named "ProjetA1".
I create one task named "Planning".
I create two tasks named "Rédaction Planning" and "Validation Planning" with parent activity "Planning".


The two tasks must be done the same day (the 22/02) :
- "Rédaction Planning" : 0,5 day
- "Validation Planning" : 0,5 day (with the predecessor element "Rédaction Planning")
In the planning, when predecessor element is active, it’s impossible to do the two tasks in the same day (0,5 + 0,5 = 1 day).

Why ???
Because dependency will alway define [start day of task 2]=[start day of task 1]+1
No matter the work : dependencies is set to force start of task 2, even if they are not assigned to the same resource.
It's because there is no "time" on tasks start / end dates. So when a task ends day X, next will start day X+1, even if the first task end mid-day.
If you wish to plan small tasks one after the other, and that these tasks are assigned to the same resource, you don't need to set a dependencies.
Just order them the way you'd like them to be planned.
Or you may also set priorities to be sure to plan them in the good order.
Regards
OK, thank you.