Hierarchy Viewer does not load after clicking on the + icon

Premise: I have a hierarchy viewer with multiple levels of master-detail with different VOs.
The inputs to the taskflow containing this page are the key and VO type. The tree should render until that VO which matches the type and key and all the next level children under it. The user can expand the nodes under these children at will to drill further.
Issue: I am able to render the tree with results. When I click on the + icon to drill on the children, I see that the backend code for fetching the children is called. But, the tree does not display. It shows the loading icon forever.
Example:
Organization - PO - POItem - Vendor - VendorSite -VendorAddress
                                                       - Responsible - ContactDetails
                    - Project - SubProject - Location
TaskFlow Input: Vendor, 12345
The tree should dispaly Organization - PO - POItem - Vendor(12345) - VendorSite(for 12345)
                                                                                                    -Responsible(for 12345)
If the user expands any of the VendorSites, the VendorAddresses should be shown
Technical Details: JDeveloper Version: 11.1.2.1.0
Code: To filter the children, I am overriding the CreateViewLinkAccessorRS in the VOImpls. I am passing bind variables to the VO criterion to check the paths.

@Arunkumar: Yes, I ran the AM tester and I am able to see the results properly for all the VOs and levels.
I created a sample on the HR Schema and tested. I see that when I click on the Employee node for expansion(can be checked with the data or the short description), it hangs with the load icon.
I do not see anything in the log other than:
<RegionRenderer> <encodeAll> The region component with id: r1 has detected a page fragment with multiple root components. Fragments with more than one root component may not display correctly in a region and may have a negative impact on performance. It is recommended that you restructure the page fragment to have a single root component.
I do not see any upload options here to give my testcase. So, I uploaded to this link: https://www.dropbox.com/s/vybip3owzuziz86/HRHierarchyViewer.zip
Please let me know if I can do this elsewhere for easy access.
Message was edited by: Divya Bellamkonda

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Hierarchy Viewer does not load after clicking on the + icon

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