I came across a situation like to built ALV IDA on external dictionary view and it is working smooth and supports to External view for calculation view with projection node(non cube) and attribute view only.
For more information about ALV IDA SAP GUI – SAP Library
Steps Involved :
1. Create HANA calculation view either attribute view.
2. Create external dictionary view(Sync & activate).
3.Create ALV IDA ABAP program.
4. ALV IDA output with nested aggregation.
I hope this might be useful or helpful.