Task Status of Completed changes incorrectly back to Not Started

Document ID : KB000103998
Last Modified Date : 16/07/2018
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Issue:
Task Status of Completed changes incorrectly back to Not Started. The % Complete for the tasks also changes from 100 to another amount (not necessarily 0, which would be expected with task status of Not Started)
Cause:
This can happen if the % Complete Calculation Method on the project is set to Effort. 
Resolution:

To check to see if the % Complete Calculation Method on the project is set to Effort:

  1. Go to Home->Projects
  2. Click the Options icon on the right hand side then Configure
  3. Move '% Complete Calculation Method' from 'Available Columns' to 'Selected Columns' and click 'Save and Return'
  4. On the project list, filter for the project that has the issue and observe the % Complete Calculation Method value
To prevent this issue from happening, the % Complete Calculation Method on the project should be changed to Manual.

Note:
  • It is not recommended to change the % Complete Calculation Method of a project once it's been set as this can impact the project data, so prior to changing the % Complete Calculation Method, it's recommended to test out this change in non production first to verify the impact. 
Additional Information:
Reference % Complete Calculation Method section of the Create Projects, Teams, and Tasks documentation for details on the differences in the three types of % Complete Calculation Methods.