The key-field element in an <ejb-relationship/> define how primary keys of "this" entity are mapped to database columns. In your jbosscmp-jdbc.xml, you have the key-field in the ejb-relationship-role where "this entity" is the customer, so you are defining the column (aid) in the address table that will hold a foreign key back to the customer. (Of course, since the aid column is the primary key column for the address table, that won't work.) You need to move your key-fields element into the other ejb-relationship-role.
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