Index: lams_build/lib/lams/lams.jar
===================================================================
diff -u -re81b268e07447ac07e027363d79aec58c942bf60 -r8b8470ff8beb15b7172cb003b22eee92427e6785
Binary files differ
Index: lams_central/src/java/org/lamsfoundation/lams/web/LessonConditionsAction.java
===================================================================
diff -u -rd0b6f213cba1026b0c9fdbdaa5dd44a49eddd3aa -r8b8470ff8beb15b7172cb003b22eee92427e6785
--- lams_central/src/java/org/lamsfoundation/lams/web/LessonConditionsAction.java	(.../LessonConditionsAction.java)	(revision d0b6f213cba1026b0c9fdbdaa5dd44a49eddd3aa)
+++ lams_central/src/java/org/lamsfoundation/lams/web/LessonConditionsAction.java	(.../LessonConditionsAction.java)	(revision 8b8470ff8beb15b7172cb003b22eee92427e6785)
@@ -20,14 +20,12 @@
  * ****************************************************************
  */
 
-
 package org.lamsfoundation.lams.web;
 
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Date;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 import java.util.TreeSet;
@@ -170,17 +168,10 @@
 	    return null;
 	}
 
-	Long removedPrecedingLessonId = WebUtil.readLongParam(request, LessonConditionsAction.PARAM_PRECEDING_LESSON_ID,
+	Long precedingLessonId = WebUtil.readLongParam(request, LessonConditionsAction.PARAM_PRECEDING_LESSON_ID,
 		false);
 
-	Lesson lesson = getLessonService().getLesson(lessonId);
-	Iterator<Lesson> precedingLessonIter = lesson.getPrecedingLessons().iterator();
-	while (precedingLessonIter.hasNext()) {
-	    if (precedingLessonIter.next().getLessonId().equals(removedPrecedingLessonId)) {
-		precedingLessonIter.remove();
-		break;
-	    }
-	}
+	getLessonService().removePrecedingLesson(lessonId, precedingLessonId);
 
 	// after operation, display contents again
 	return getIndexLessonConditions(mapping, form, request, response);
@@ -201,16 +192,9 @@
 	    return null;
 	}
 
-	Long addedPrecedingLessonId = WebUtil.readLongParam(request, LessonConditionsAction.PARAM_PRECEDING_LESSON_ID,
+	Long precedingLessonId = WebUtil.readLongParam(request, LessonConditionsAction.PARAM_PRECEDING_LESSON_ID,
 		false);
-	Lesson lesson = getLessonService().getLesson(lessonId);
-	Lesson addedPrecedingLesson = getLessonService().getLesson(addedPrecedingLessonId);
-	if (addedPrecedingLesson == null) {
-	    throw new IllegalArgumentException("Preceding lesson with ID: " + lessonId + " does not exist.");
-	}
-
-	lesson.getPrecedingLessons().add(addedPrecedingLesson);
-
+	getLessonService().addPrecedingLesson(lessonId, precedingLessonId);
 	// after operation, display contents again
 	return getIndexLessonConditions(mapping, form, request, response);
     }
@@ -220,7 +204,6 @@
      *
      * @throws IOException
      */
-    @SuppressWarnings("unchecked")
     public ActionForward setDaysToLessonFinish(ActionMapping mapping, ActionForm form, HttpServletRequest request,
 	    HttpServletResponse response) throws IOException {
 	Long lessonId = WebUtil.readLongParam(request, CentralConstants.PARAM_LESSON_ID, false);
Index: lams_common/src/java/org/lamsfoundation/lams/lesson/service/ILessonService.java
===================================================================
diff -u -rd0b6f213cba1026b0c9fdbdaa5dd44a49eddd3aa -r8b8470ff8beb15b7172cb003b22eee92427e6785
--- lams_common/src/java/org/lamsfoundation/lams/lesson/service/ILessonService.java	(.../ILessonService.java)	(revision d0b6f213cba1026b0c9fdbdaa5dd44a49eddd3aa)
+++ lams_common/src/java/org/lamsfoundation/lams/lesson/service/ILessonService.java	(.../ILessonService.java)	(revision 8b8470ff8beb15b7172cb003b22eee92427e6785)
@@ -424,4 +424,8 @@
     Set<Lesson> getReleasedSucceedingLessons(Long completedLessonId, Integer learnerId);
 
     void removeLearnerProgress(Long lessonId, Integer userId);
+
+    void addPrecedingLesson(Long lessonId, Long precedingLessonId);
+
+    void removePrecedingLesson(Long lessonId, Long precedingLessonId);
 }
\ No newline at end of file
Index: lams_common/src/java/org/lamsfoundation/lams/lesson/service/LessonService.java
===================================================================
diff -u -rd0b6f213cba1026b0c9fdbdaa5dd44a49eddd3aa -r8b8470ff8beb15b7172cb003b22eee92427e6785
--- lams_common/src/java/org/lamsfoundation/lams/lesson/service/LessonService.java	(.../LessonService.java)	(revision d0b6f213cba1026b0c9fdbdaa5dd44a49eddd3aa)
+++ lams_common/src/java/org/lamsfoundation/lams/lesson/service/LessonService.java	(.../LessonService.java)	(revision 8b8470ff8beb15b7172cb003b22eee92427e6785)
@@ -21,7 +21,6 @@
  * ****************************************************************
  */
 
-
 package org.lamsfoundation.lams.lesson.service;
 
 import java.util.ArrayList;
@@ -699,4 +698,27 @@
 	}
 	return releasedSucceedingLessons;
     }
-}
+
+    @Override
+    public void addPrecedingLesson(Long lessonId, Long precedingLessonId) {
+	Lesson addedPrecedingLesson = getLesson(precedingLessonId);
+	if (addedPrecedingLesson == null) {
+	    throw new IllegalArgumentException("Preceding lesson with ID: " + lessonId + " does not exist.");
+	}
+	Lesson lesson = getLesson(lessonId);
+
+	lesson.getPrecedingLessons().add(addedPrecedingLesson);
+    }
+
+    @Override
+    public void removePrecedingLesson(Long lessonId, Long precedingLessonId) {
+	Lesson lesson = getLesson(lessonId);
+	Iterator<Lesson> precedingLessonIter = lesson.getPrecedingLessons().iterator();
+	while (precedingLessonIter.hasNext()) {
+	    if (precedingLessonIter.next().getLessonId().equals(precedingLessonId)) {
+		precedingLessonIter.remove();
+		break;
+	    }
+	}
+    }
+}
\ No newline at end of file