You are prompted to confirm or specify the starting Check number for these checks. Normally you would probably prefer to print Checks at this time, and would continue here as described below. However, if you wish, you can simply exit this task now and print these Checks later.
If you use the preprinted number on the Check forms as your Check number then enter that number from the first Check that will be printed.
If you only use that preprinted number on the Check forms for physical document control of these Check forms and prefer to use the PrTransID assigned by the system as your Check number then just accept the default value presented.
The Check number is saved in the Reference field of the Payroll transaction. That Reference field is initially set to the PrTransID assigned by the system to that Payroll transaction. If you specify a different starting Check number then the system will update the Reference field in those Payroll transactions before continuing.
Remember that these Check transactions have already been processed and have already updated the permanent transaction tables. They just haven't been printed yet. Previewing them on the screen simply shows you what will be printed.
If you accidentally processed a Check incorrectly then you can Reverse it later using the Payroll transactions maintenance task. When you Reverse that Check the system will generate a full reversing transaction.