Hi Prasad,
Go through the detailed process,
T code: se38
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enter RPUDEL20 as I shown in the screenshot, and execute the same,
after executing you can select the employee personnel numbers
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Once you select all the employee numbers or don't select any number I will automatically catch all the numbers.
here you can select which month payroll result you want to delete, (be careful while selecting the right month)
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once after selecting go for delete option, still you have any doubt get back to me Image may be NSFW.
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Good luck,
Regards,
Naresh.KM