when i am updating the schedule on current date then some activity showing "Start no earlier than" constraints .
i want to know why these constraints are coming. if constraints came means my schedule is wrong or what?
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Here is the highly simplified version of how you use the tool:
At the time of preparing the project plan
Based on this input, the tool calculates the start date and end date for each task.
Updating the project status day-to-day
The tool will show today's line and whether your progress is ahead or behind schedule with respect to that, based on the percentage completion you entered.
It is not a good practice to change the start date (or end date) directly for status update purposes. If you do, the tool assumes that you are setting a task start date constraint. The default constraint for a start date is "Start no earlier than".
Here is the link: Set a task start or finish date (constraint) for a task
Project management tip: Let Project do what it does best — schedule your project. Set task durations yourself and create links between tasks, and then Project will calculate the task start and finish dates.