Extend the base customer type to support a field list for application sopecific vlaues. Set to true when this customer can be associated to transactions in multiple currencies. A classification associated to the customer. This list can be extended. Known Classifications will include: SupplierType SupplierPriceGroup Market Industry code SIC Code NAICS Customer can only point to a Corporate customer, ShipTo, BillTo, and PayFrom can only point to a Customer.