FAQ Home   4428. I changed my employee's payment frequency from Weekly to Monthly. I am unable to process the salary for next 3 weeks. It shows that I have already processed the pay for this employee?   Once you process a weekly employees pay and change the pay frequency to monthly, by default the YTD will be updated for that pay period month in which that week falls into. So it won't allow you to process the pay for the other two weeks. You can either roll back the pay period for which you have processed the pay and rerun the payrun again for that whole month including the previous week Or You have to pay the weekly employee for all the 4 weeks and then change the pay frequency.