Sage 200 Web Portal Purchase Invoice and Credit forms feature automatic checks on the Reference fields.
You can find out more details about the Web portal here:
- Sage 200 Standard: https://desktophelp.sage.co.uk/sage200/standard-web/Content/Home.htm
Sage 200 professional: https://desktophelp.sage.co.uk/sage200/professional-web-2023R1/Content/Home.htm