Settings > Settings Window - Company > Settings Window - Company > Forms > Suppress Messages in Multi-User Mode when Form Number Changes
                                
                                Available in Sage 50 Quantum Accounting and higher.
Suppress Messages in Multi-User Mode when Form Number Changes
To suppress conflict messages in a multi-user environment when a form's displayed and assigned numbers are not the same.
- In the Home window, on the Setup menu select Settings. Open Company and select Forms.
 - Select Use Next Available Form Number for the appropriate transaction types.
 - Click OK.
 
Note: This option cannot be turned off when Fast Posting is in use.