QuickBooks

An Invoice is modified when:

RouteTask Status Changes

If the status is Complete and all the other RouteTasks on a ServiceTemplate are Complete: Create a new Invoice

If any status on a ServiceTemplate is not Complete: Delete any related Invoice (reference is part of the ServiceTemplate)

QuickBooks part of a Service Template changes

Do nothing this will only affect future generated Invoices

-for consistency with ServiceTemplates only propagating to future services

-to allow the user to feel safe when editing invoices in QuickBooks

-because it is the easiest :)