task start date changes when I update task

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We are midway through a project. It seems that this issue just started to
happen. When I update % completed for a simple task, Project ignores
predecessors assigned to this task and moves the start date of the task to
the start date of the project (last year). I am at a loss to what I have
done that is causing this.
-update % complete within a task
-warning pops up that "you are about to change the start date to before the
project starts"

My work around is to apply a do not start before date, but that is not an
effecient method.

Please help...
--

-TS
.



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