Even after you have approved you will still be able to delete it. This is to ensure that you can modify if you make any mistake. See guide below:
Step 1: Click on
Step 2: Click on
Step 3: Click on
Step 4: Click on the number at the Approved column
Step 5: You will see this page.
Step 6: Look for the staff whose pay you want to delete the payrun and then click on the to delete the payrun.
Step 7: The system will prompt you are you sure of the deletion. Click on . The system will show you the number of records you deleted at the Rejected column.