Difficulty with portals
Maybe it's because i'm too tired but I can't solve this.
I have a table and layout called CONTACTS, that relates to another table and layout called INVOICES, through "id contact".
So, a portal lists all invoices of the same contact, on the contact layout.
Each invoice has a portal, with line items, related to a table called LINE ITEMS, through "id invoice", which is related to a table called PRODUCTS, through "id product".
I would like to be able to list on the contact layout, through a portal, a mix of invoice ítems (which i already can do) and all the products bought (line items) and that are in the correspondent invoices of that contact.