CA PPM: Unable to Add Work to Timesheet due to error TMA-1003

Document ID : KB000118685
Last Modified Date : 30/10/2018
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When adding work to a timesheet, the following error is displays:
TMA-1003: Resource assignment is either invalid or there is already an existing time entry for the assignment: Resource ID

This is due to a project team or task configuration issue.
Check if one of more of the following is required:
-Is the user a team member of the project and assigned to the task?
-Change the project task status to 'Started'