You have incomplete tasks in Works view of Time Administration work center which cannot be removed.
SAP Business ByDesign
Reproducing the Issue
Go to the Time Administration work center.
Go to the Works view.
You might see some tasks marked as red with name "Complete Time Data" and you cannot delete them.
These tasks are incomplete Time Data tasks of Employees.
Complete Time Data for the employee. If you don't want to maintain Time Data for an Employee simply open the task by clicking on it and click Finish. After that these tasks won't appear in the Works view.
Time Data tasks, Time administration , KBA , AP-TIM , Time and Labour Management , Problem