SELECT hza.cust_account_id, hza.account_number from hz_cust_accounts hza union all select -2, FND_MESSAGE.get_string('FII', 'FII_AR_UNID_CUSTOMER') from dual
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SELECT HZA.CUST_ACCOUNT_ID , HZA.ACCOUNT_NUMBER FROM HZ_CUST_ACCOUNTS HZA UNION ALL SELECT -2 , FND_MESSAGE.GET_STRING('FII' , 'FII_AR_UNID_CUSTOMER') FROM DUAL