No need for that added field.
Go to your invoice layout and replace the container field from lineitems with the container field from products. With this set up, you should see the picture from products appear in the row of the portal when you select a product.
Sorry but that didnt work. I downloaded a fresh version of Invoice, reduced the width of Product Name and inserted the field Products:picture.
However, it says its an <Unrelated Table>
This is the invoices starter solution?
If so, the field should be added from "related products" not products. Related Products and Products are occurrences of the same data source table. Related Products is the one linked to the lineitems table in the proper relationship.
Yes, its the Invoice starter solution. That helped and I found the solution - I was forgetting I needed to go into the Itemline field and get it to lookup the related products field.
All sorted, thanks for the help.