[rules-users] Problem in the set variable in the rules

hi list, Y have the next problem in the rules: rule "Valida Duracion nula" when $v : Validaciones(flag == 0) then $v.setFlag(1); System.out.println( "obtenemos flag " + $v.getFlag() ); end rule "valida Duracion Destino" when $v: Validaciones(flag == 0) then $v.setResultado("l"); System.out.println( "obtenemos " + $v.getResultado()); System.out.println( "obtenemos cantidad seg dos " + $v.getFlag() ); end the problem is: the flag variable values begin in 0 (in the class in java), in the first rules the change a 1 (setFlag) and Should not execute rule seconds her, But it is executed, why? thanks.