I know this one has been answered before, but I was hoping someone came up with a better solution in the last 14 months.

I need customers to drill down from their list with invoices to their invoice lines (specification). So I need to filter the entity list Invoice lines on the GUID of the selected Invoice.

One possibility is to use liquid, query string and fetch xml to retrieve and show the items (https://community.dynamics.com/365/b/dynamics365apps/archive/2017/09/13/dynamics-365-portals-liquid-templates-part-3-retrieve-data-using-fetchxml).

But in that solution I don't have the cool entity list component with filters and a download button !

Can someone help me out?