Task Status of Completed changes incorrectly back to Not Started in Clarity PPM. 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)
This can happen if the % Complete Calculation Method on the project is changed to Effort. This happens if there are no actuals on the tasks as effort is calculated based on actuals, so if there are no actuals on the task, the task status changes to "Not Started".
For Effort % Complete Calculation, the percent complete is calculated based on the following formula:
% Complete = Labor Actuals/( Labor Estimates + Labor Actuals)