Error: You have already created a timesheet entry for this week. The transaction ended in the trigger. The batch has been aborted.

This error suggests that the timesheet being created already exists for that Week Commencing.
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It is not possible to have multiple timesheets for an employee on the same week.
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The employee/manager should check their timesheets process to ensure the allocated timesheet is actioned.
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If you require further guidance with this, please raise a new case online and reference the title of this article.