Available parameters to use in PER_VISA_PERMIT_DFF (Visas and Permit)?

Summary:

I am trying to create a DFF segment (checkbox field) with value based on the attribute from Assignment

Content (please ensure you mask any confidential information):

I need the value in ****_attribute1 from the per_all_assignments_m table to be used as parameter for the Visas redwood page. If for example, ****_attribute1 is not null, then make the checkbox value in the Visa DFF segment = "Y"

Version (include the version you are using, if applicable):

26A

Code Snippet (add any code snippets that support your topic, if applicable):