CHOOSE RELATED RECORDS
I have attached relationships.
I can create shipping form with a portal to select different books and quantities from "Books" without problem.
Problem comes when I want to pack the books!!
Each shipment is to be done with many boxes and inside the boxes it can be put different books and quantities of the same shipping form.
I created a portal in "Packing" where, from the same shipping form, I would like to choose which book to put in the which box and input stuffed quantity.
My problem is, I cannot find a solution to be able to choose and select in the portal the books belonging to a unique shipping form.
I tried many solution with filtering and values from drop-down list but I cannot find one.
I am starting to believe that I have a mistake at relationship level but don't know where!