Redwood Page - BIP Report Link Not Receiving Page Variable

Summary:

We are embedding a BI Publisher report link in the Redwood Requisition page. The expectation is that when a user clicks this link, the BIP report should open in a new window and automatically execute using the Requisition Header ID from the page.

However, the page variable is not getting passed to the report, so the report does not run with the expected data.

If we hard code the requstion on the page vaiable the report is getting excuted

What is the correct way to pass Redwood page variables into a BIP report link?
Is there a specific syntax or binding mechanism required in the Redwood UI to pass page variables to an external URL?