MSP: Invalid project Summary task constraint
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MSP: Invalid project Summary task constraint


Article ID: 130911


Updated On:


Clarity PPM SaaS Clarity PPM On Premise


The project summary task (task 0) of a project has an invalid 'Start No Earlier' constraint, which then prevents the project from opening correctly when launched from Clarity to Microsoft Project. Every time the project is launched to MSP, an error message regarding the constraint is thrown:

"This action will cause a scheduling conflict for summary task 0 <task name>.

  • To remove the constraint on the summary task, click OK.
  • To undo the action that caused the conflict, click Cancel."

Clicking on OK does remove the constraint, but the message reappears any of the following times the project is launched to MSP, even if the project is saved back to Clarity without a constraint. 

The Project Summary Task should not have a constraint, so the expected value for the constraint is NA. 

How do you get the constraint of NA to permanently remain on the project summary task? 


Release: All
Component: Clarity Microsoft Project New Driver


  1. Prior to attempting the steps in this KB, check to ensure the issue is not solved by KB: MSP "scheduling conflict for summary task 0" message due to MSP Setting
  2. If the above KB doesn't help, remove the project from the prdocument table using the steps in the following KB: Remove a MSP project from the prdocument table

Additional Information

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