I need to plan some activities backwards from a fixed deadline. I am used SF dependencies for that, and there's a slight problem. Let's say I have the following simple plan:

1 Milestone
2 Activity A    2 hours    1SF
3 Activity B    9 hours    1SF
4 Activity C    1 hour     2SF;3SF

I expect Activity C to start before BOTH Activity A and B (i.e., 9 hours before Milestone), but it starts before Activity A, only 2 hours before Milestone.

Is there a way to force MS Project to respect both constraints?

I need to plan some activities backwards from a fixed deadline. I used SF dependencies for that, but there's a slight problem. Let's say I have the following simple plan:

1 Milestone
2 Activity A    2 hours    1SF
3 Activity B    9 hours    1SF
4 Activity C    1 hour     2SF;3SF

I expect Activity C to start before BOTH Activity A and B (i.e., 9 hours before Milestone), but it starts before Activity A, only 2 hours before Milestone.

Is there a way to force MS Project to respect both constraints?