R12.1.3 Cannot view POs in through iSupplier portal

Hi,

I am trying to setup iSupplier portal in a test environment. I have already completed the following steps:

1. Setup a custom responsibility similar to "iSupplier Portal Full Access".

2. Applied securing attributes ICX_SUPPLIER_CONTACT_ID=-9999, ICX_SUPPLIER_ORG_ID=blank, ICX_SUPPLIER_SITE_ID=-9999 to the custom responsibility.

3. Made the custom responsibility - External through profile option.

4. Created a supplier user through System Admin and assigned ICX_SUPPLIER_ORG_ID=<<Supplier ID>> in the securing attribute for the user. Also assigned the custom responsibility to the user

At this point, when I try to login as the supplier user, I am able to see the PO notifications and view the POs in the PDF attachments. I can even create ASNs. But I am not able to see the purchasing documents as such. When I click on the PO in ASNs, it throws an error message saying that PO details are not available.