failed filter across multiple tables

Hi ginalu 

If you follow the line along:

User -> Org (user can filter Org)

Org <- Plan (plan can filter Org)

You are trying to do:
User -> Org -> Plan

There are two ways to do this:

Change Plan -> Org to Plan <-> Org

Use a Dax Calculation: 

CrossFilter Plan Org =
Calculate(
               [Your calculation] , CrossFilter( Plan[Org_id], Org[Org_id], both))

This video explains the CrossFilter function: CROSSFILTER - DAX Guide - YouTube

This one explains the issue with ambiguity: Bidirectional relationships and ambiguity (youtube.com)