Código SQL [-] SELECT C.ID, C.CASO, ... , /* (demas columnas) */ COALESCE((SELECT FIRST 1 MONTO FROM PAGOS P WHERE P.CASO_ID = C.ID ORDER BY P.FECHA DESC), 0) FROM CASOS C
SELECT C.ID, C.CASO, ... , /* (demas columnas) */ COALESCE((SELECT FIRST 1 MONTO FROM PAGOS P WHERE P.CASO_ID = C.ID ORDER BY P.FECHA DESC), 0) FROM CASOS C