Index: lams_common/src/java/org/lamsfoundation/lams/gradebook/dao/hibernate/GradebookDAO.java
===================================================================
diff -u -r9357467901bacb28df24a695ec35e99434ebbea9 -r4bd901f8cd447f390f2a75bb412bd3777589c687
--- lams_common/src/java/org/lamsfoundation/lams/gradebook/dao/hibernate/GradebookDAO.java	(.../GradebookDAO.java)	(revision 9357467901bacb28df24a695ec35e99434ebbea9)
+++ lams_common/src/java/org/lamsfoundation/lams/gradebook/dao/hibernate/GradebookDAO.java	(.../GradebookDAO.java)	(revision 4bd901f8cd447f390f2a75bb412bd3777589c687)
@@ -600,7 +600,7 @@
 		.setLong("lessonId", lesson.getLessonId()).setParameterList("userIds", userIds).list();
 	return results;
     }
-
+    
     @Override
     public List<GradebookUserLesson> getGradebookUserLessons(List<Long> lessonIds) {
 	final String GET_GRADEBOOK_LEARNER_LESSONS_BY_LESSON_LIST = "FROM GradebookUserLesson ul WHERE "
Index: lams_gradebook/src/java/org/lamsfoundation/lams/gradebook/service/GradebookService.java
===================================================================
diff -u -r434d2037869d4af720432ae77ede91c095c1382c -r4bd901f8cd447f390f2a75bb412bd3777589c687
--- lams_gradebook/src/java/org/lamsfoundation/lams/gradebook/service/GradebookService.java	(.../GradebookService.java)	(revision 434d2037869d4af720432ae77ede91c095c1382c)
+++ lams_gradebook/src/java/org/lamsfoundation/lams/gradebook/service/GradebookService.java	(.../GradebookService.java)	(revision 4bd901f8cd447f390f2a75bb412bd3777589c687)
@@ -458,8 +458,17 @@
 		gradebookUserLesson.setLesson(lesson);
 	    }
 
-	    aggregateTotalMarkForLesson(gradebookUserLesson);
+	    // In order to calculate lesson's mark correctly we need to flush the session beforehand. This is required
+	    // as change to gradebookUserActivity isn't synchronized with the DB at this point due to the current transaction isn't
+	    // committed yet
+	    gradebookDAO.flush();
 
+	    // Calculates a lesson's total mark and saves it
+	    Double totalMark = gradebookDAO.getGradebookUserActivityMarkSum(gradebookUserLesson.getLesson()
+		    .getLessonId(), gradebookUserLesson.getLearner().getUserId());
+	    gradebookUserLesson.setMark(totalMark);
+	    gradebookDAO.insertOrUpdate(gradebookUserLesson);
+
 	    // audit log changed gradebook mark
 	    if (isAuditLogRequired) {
 		UserDTO monitorUser = (UserDTO) SessionManager.getSession().getAttribute(AttributeNames.USER);
@@ -1225,18 +1234,6 @@
     }
 
     /**
-     * Adds a mark to the aggregated total and saves it
-     * 
-     * @param gradebookUserLesson
-     */
-    private void aggregateTotalMarkForLesson(GradebookUserLesson gradebookUserLesson) {
-	Double totalMark = gradebookDAO.getGradebookUserActivityMarkSum(gradebookUserLesson.getLesson().getLessonId(),
-		gradebookUserLesson.getLearner().getUserId());
-	gradebookUserLesson.setMark(totalMark);
-	gradebookDAO.insertOrUpdate(gradebookUserLesson);
-    }
-
-    /**
      * Gets the GBActivityGridRowDTO fro a given activity and lesson
      * 
      * @param activity