Settings > Settings Window - Company > Settings Window - Company > System > Turn On or Off Use of Cheque Numbers for Source Codes 
 on Reports
                                
                                Turn On or Off Use of Cheque Numbers for Source Codes on Reports
To set up using cheque numbers as source codes on reports:
- In the Home window on the Setup menu, choose Settings.
 - On the left side of the window, click Company and then System.
 - Select or clear the Use the Cheque No. as the source code for cash purchases and sales option.
 - Click OK.