Cannot Select ID Attribute on my ADP

Summary

Created ADP Variable to be populated by REST Service Call

Content

Hello,

I've created a connection to our ERP for payables payments.  No problem there.  I can display the information in a table, etc.

However, I plan to call the web service and populate an ADP variable and base the table in the UI on that ADP.

The problem I am running into is this:  When I assign the Type for the web service to the ADP variable, I am unable to see any of the item attributes when I attempt to assign an ID Attribute.  This is very straightforward so I do not know what I am doing wrong.