Trying to locate table(s) and specific field names to indentify the AR Field 'AGENT'

I'm trying to find the link as to where information is stored for an AR field called 'AGENT' within the customer address profile in the Business Purpose window within the Details tab.  I've identified the Sales Territory as being within  HZ_CUST_SITE_USE_ALL table and using the 'Territory_Id' field is related the table RA_TERRITORIES.  

I am assuming that 'Primary_Salesrep_Id' could be related to the AGENT field but not possitive. So could someone point out the tables and the specific link that I could look for?   Thanks.