Index: lams_central/src/java/org/lamsfoundation/lams/authoring/service/AuthoringService.java
===================================================================
diff -u -r8cbd631849cddfbfc7fb887e8a847894e5baaefa -r212565acfc9cac9309b509a570b33c5409b9e0a2
--- lams_central/src/java/org/lamsfoundation/lams/authoring/service/AuthoringService.java	(.../AuthoringService.java)	(revision 8cbd631849cddfbfc7fb887e8a847894e5baaefa)
+++ lams_central/src/java/org/lamsfoundation/lams/authoring/service/AuthoringService.java	(.../AuthoringService.java)	(revision 212565acfc9cac9309b509a570b33c5409b9e0a2)
@@ -693,9 +693,11 @@
 			transitionDAO.update(toTransition);
 
 		} else if (toTransition != null && fromTransition == null) {
+		    	toTransition.getFromActivity().setTransitionFrom(null);
 			design.getTransitions().remove(toTransition);
 		} else if (toTransition == null && fromTransition != null) {
 			design.setFirstActivity(fromTransition.getToActivity());
+			fromTransition.getToActivity().setTransitionTo(null);
 			design.getTransitions().remove(fromTransition);
 		}