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Have task 7 day lag before another task

Have task 7 day lag before another task

I'm using Primavera P3.  I have one central task with predecessors and successors and which will shift throughout the project.

I need to create a task which will always be 7 days before the start of this other task.

I have tried a SS and SF with a -7D lag.  But it does not seem to work (the date of this new task does not seem to automatically calc 7 days prior)

RE: Have task 7 day lag before another task

Is the "task which will always be 7 days before the start of this other task" a milestone or an activity?
Does it require resources?
Does it have a variable duration?

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