While creating Visual Mobile Application, unable to reference a nested object array attributes from

Summary

Tried to populate a variable with the output of a REST endpoing of a BO for editing purposes, however, unable to reference a nested object array attribute as required.

Content

I am facing some issues in fetching a Business Object in an editable screen. I have the following structure in the Business Objects.

1. Item BO - Has Item Details
2. CartItem BO - Has Additional details along with the Item Reference as one column.

Cart Item and Item BO have a one-to-one relationship. I need to show all the CartItems and I need to edit them in a single button click from an Edit Page.