Some tasks in Clarity PPM are not being able to be edited to be set to "Completed" or the % complete is changed to 00% but the status still says "Started" and cannot be edited to "Completed" while other tasks are not facing this issue.
For the % Complete Calculation Method of Effort, non labor resources are not included in the calculations. In order for the task % Complete and Statuses to be able to changed, the project % complete calculation method would need to be Duration or Manual. Note: It is not recommended to change a % Complete Calculation Method of a project once it's been set as this can impact the task data.
Note: Even if the % Complete Calculation Method of the project is set to Manual, in order to be able to save a task status of Completed, there must be 0 ETCs on the task. See KB000103580 for an error you can see on the Gantt when trying to update a task with ETCs greater than 0.