How to correct a paycheck when payroll is still open and the check number has been assigned
To begin with, void the paycheck.
You may now make any corrections and then reissue the check in the same payroll, since the payroll is still open. After voiding the check, go to step 3) Edit Timecards and continue to process payroll as usual. New checks will be generated for any selected employee who does not already have a check, including employees whose checks have now been voided.
Then reissue it with the correct check number. You will be able to change the check number, if necessary, when you get to the print screen (see image below).
NOTE: If you want to use a check number that is showing as voided in the software you will need to add an alpha character to the end of the check number. Example: check number 1223 could be assigned check number 1223A. This would allow you to use the check stock that you have.
Be sure to review the links provided above for additional information on voiding a paycheck.