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You have checked the settings in Customizing for Vehicle Sales and Service under Service > Time Management. Particularly if MRS is active, you have determined under Determination of Criteria for Use of Time Management > Define Criteria for Sales Organization that time stamps should be created on task level.
You have maintained HR master data for each employee.
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On the SAP Easy Access screen, choose Logistics > Logistics Execution > Vehicle Sales and Service > Time Management > Correction Terminal. Alternatively, run transaction /DBE/TM_CORR_TERM. After you entered the selection criteria, the system displays the time stamp overview on the Time Stamp Overview tab.
If you choose the Create Time Stamps pushbutton or select a time stamp on the Time Stamp Overview tab and choose the Change Time Stamp pushbutton, you can enter the relevant data in a dialog box.