How to show entire address during invoice entry? Issues because we don't have access to supplier's

Our specialist have processing issues because they don't have access to the entire supplier's address right on the invoice workbench when they're entering invoices from imaged invoices.  We often have suppliers with multiple sites in the same city, so they have to click into the site field to try to pick the right location.  BUT when they click on a site, to pull up the address, it doesn't have all of the address fields, and worse, it blanks out the banking information in the form, causing issues down the line.  Part of the problems have been addressed with training and