Fair enough. How about an optional field on the customer record? Text optional fields hold up to 30 characters and are printable on specs. Codes C55-C57 are for Receivables Statement (and Letter) specs, and for OE documents the codes are C31-C33. All can be found in the 'Customer Info' section of the spec fields list. Using this means you don't have to change your address layout. This information can be imported from Import Customers in Receivables.

To set up optional fields, you edit the Adagio Receivables company profile and define field Titles for which optional fields you want to use. Then when editing a customer, these Titles will appear on the Credit Card tab.