code: public void setGoalRevenue(Double goalRevenue){
          if (goalRevenue != null && getGoalId() == null){
              throw new IllegalStateException("GoalId must be set before GoalRevenue can be set.");
          }
          setParameter(GOAL_REVENUE, goalRevenue);
      }
docs: Set a monetary value that was generated as revenue by this goal conversion.
  Only used if idgoal is specified in the request.
  @param goalRevenue the goal revenue to set.  A null value will remove this parameter