An idea could be to add "materials" to the list of items that can be selected so when certain materials are added to the invoice, a form will trigger.
*Great for; non serialized materials that need to be registered, important materials that require more detailed information, warranty materials,
I would argue that if it is an important material that requires more detailed information on warranty and needs to be registered, equipment and not materials would probably be a better spot for that item in your pricebook and then you could trigger the form to that equipment. Just FYI.
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