QPR-11916 fix enddate

Author: damienbarker

OREData/ored/portfolio/indexcreditdefaultswapoption.cpp

@@ -135,7 +135,7 @@ void IndexCreditDefaultSwapOption::build(const boost::shared_ptr<EngineFactory>&
     Date exerciseDate = parseDate(exerciseDates.front());
     boost::shared_ptr<Exercise> exercise = boost::make_shared<EuropeanExercise>(exerciseDate);
 
-    QL_REQUIRE(parseDate(legData.schedule().rules().front().startDate()) > exerciseDate, 
+    QL_REQUIRE(parseDate(legData.schedule().rules().front().endDate()) > exerciseDate, 
         "IndexCreditDefaultSwapOption: ExerciseDate must be before EndDate");
 
     // We apply an automatic correction to a common mistake in the input data, where the full index underlying