• Firstly, Go to Masters > Passwords & Powers > Operator's. Press Enter.

• A 'Password & Authority' window will appear.

• Select the user to make changes. Press Enter.

• A 'Powers' window will appear in which the user will select ‘Search In All’.

• A 'Powers' window will appear in which the user will search 'Allowed' .

• Now click on ‘Accept’.

• An 'Allowed' Window will appear.

• In 'Billing not Allowed on N-Loss A-Ask M-Margin & Loss H-Ask Y-Allow the user will select 'N'.

• The user will now press 'Esc' key.

• Again press 'Escape' key and then click on ‘Yes’ to save the changes.

• A 'Powers Change' POP-UP will appear and then the user will press 'ESC' key.

• Press 'Escape' key and then click on ‘Yes’.

• Now for Re- login the user will press 'Ctrl + U' on the main screen. 

• A 'Change User' window will appear in which the user will enter the User ID and Password.

• A 'Change User' window will appear in which the user will press 'ESC' Key.

After following the above steps can't be able to do billing of negative amount.