How to change the supplier for a duty when an invoice has already been created

Go to Operations - Billing - click on an invoice listing - click on Edit - Scroll down to the booking that needs to be edited - click on the small gear icon to the right of the booking listing - click on Remove booking - click Save.

Once the booking has been removed from the invoice, it will move to the Completed section in Duties.

Go to Duties - Completed - Click on the duty listing - using the small gear icon click on clear duty slip - this will clear the duty details and move the duty to the allotted tab - now select Clear allotment or Re-allot - select a different driver/supplier - the duty will be back in allotted state, following which you can close the duty.

Add the duty to the same invoice again.

Go back to Operations - Billing - click on the same invoice - click Edit - scroll to the bottom of the invoice and click on the Add booking button. You will get a pop-up with all the bookings of that customer that have completed duties - select the booking and click Next - select the duties and click on Add duties - the booking with the new supplier is now added to the invoice - click on Save to save the invoice.