Also interested in this use case!
I think the issue is that Product, Rate plan and Charge custom fields are not available on the invoice as mergefields. Why is that?
I cant even use the Zuora native field "Product Category" on an invoice - either to display it OR use it as a sort criteria.
The exact use case here would be the following:
Bundle Name Item 1 Item 2 Etc. Subtotal Bundle Product Type Hardware Item 1 Item 2
Subtotal Discount Etc. Product Type Software Item 1 Item 2
Subtotal Discount Etc Product Type Service Item 1 Item 2
Subtotal Discount Etc
This would all be possible if I could access the product/rateplan/charge custom mergefields on the invoice.
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