Unable to update % complete or other attribute values on any of the tasks in a project in Clarity PPM.
Check to make sure that the Save button being used is the one in the General section of the Task Properties. The bottom Save button, if there is an assignment on the task, will save changes to the assignment section. The Save and Save and Return buttons in the Task Properties General section is used to save changes to the task details such as % Complete, and task Status.
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See KB000103484 - Task status and % Complete cannot be changed and there is a mismatch in the two values