@Yubetcha @karlenigma I use dynamically sourced fields on advanced PDF's quite a bit, that's not an issue. The only things you have to keep in mind is a) you can't reference an item field directly - you need to add a transaction line custom field that sources from the item record b) you have to make sure it is checked in customize form to display in the UI otherwise it is not passed to the template (if you want to hide it in the UI there is a workaround which is to clear the label).