Payroll numbers should not be user input. The payroll number should be auto calculated by the submission sequence. It's required that payroll numbers remain in order. Once the first week ending date is selected by the contractor that is payroll #1. Then every single report from there on out is auto numbered by the system. This is a DOL procedure. Refer to https://www.dol.gov/agencies/whd/forms/wh347

Certified Payroll No.: Beginning with the number “1”, each weekly certified payroll that a contractor or subcontractor submits for a project should be given a payroll number. Enter the appropriate payroll number.