Answer:
There are some printed transaction forms such as: System Generated Checks, System Generated AR Invoices and Purchase Orders , that can result in overflow forms which in turn utilize the next sequential document number.
For example, you have an Accounts Payable check that is paying 20 invoices. Since invoices are listed on the check stub, because of the number of invoices being paid on this single check, the invoice listing would overflow to a second check and thereby utilize a new check number.
You can design a default format or a custom format as follows, so that only one document number will be used rather than two.
The procedure that follows, details how to edit an A/P Check format so that the system only uses a single check number, even though a second check is produced. The system will print the form number on the Overflow form only. The same logic applies to AR Invoices, Purchase Order and Payroll check forms:
1.Navigate to: Reports>Forms Designer (Payroll check formats are accessed: Payroll>Reports>Forms Designer)
2.Layout Type: A/P Checks
3.Choose Template: Pre-Printed Stock: <Abila MIP Forms – Check>

4. Click OK to display the format

5. Locate the field titled: [Document] (Blue arrow in above screen shot)
6. Right Click on this field and select Properties

7. In the Database Field Properties Window select the Conditions tab

Under Rules, use the down arrow and select one of the following
All Forms determines there will be a check number on all forms printed
Last Form determines there will be a check number on the last form printed
Overflow Forms determines there will be a check number on the overflow forms printed
First Form determines there will be a check number on the first printed form
