start date constraint on tasks

Discussion created by RonaldoRezende-TecBan on May 15, 2013
Latest reply on May 20, 2013 by Chris_Hackett
Clarity has added several start date constraints on my tasks, when I open the schedule in MSP.
I know some situations that cause this behavior, like these:
- someone posts the week timesheet without appoint hours to an activity that should start on this week; then clarity add the start date constraint and change the start date of the task.
- after resource allocation, when clarity replace role resource by named resource, if a task is in a vacation period, clarity add the start date constraint to the task and change the start date.

But, there are some situations that I don't know why this happened.

Is there some list with all possibile situations that cause this behavior? Is there some know bug with this subject?

I'm using version 12.1 and I'm testing version 13.1. I've perceived this behavior in both versions.