Index: lams_central/conf/language/lams/ApplicationResources.properties
===================================================================
RCS file: /usr/local/cvsroot/lams_central/conf/language/lams/ApplicationResources.properties,v
diff -u -r1.142 -r1.143
--- lams_central/conf/language/lams/ApplicationResources.properties	17 Oct 2014 18:40:18 -0000	1.142
+++ lams_central/conf/language/lams/ApplicationResources.properties	22 Oct 2014 10:23:28 -0000	1.143
@@ -457,7 +457,8 @@
 authoring.fla.branching.end.suffix =end
 authoring.fla.remove.activity.confirm =Are you sure you want to remove the whole branching activity?
 authoring.fla.branching.create.confirm =Transition from this activity already exists.\\nDo you want to create branching here?
-authoring.fla.transition.to.exists.error =Transition to this activity already exists
+authoring.fla.transition.to.exists.error =Transition to this activity already exists.
+authoring.fla.circular.sequence.error =You are not allowed to have a circular sequence.
 authoring.fla.default.annotation.label.title =Label
 authoring.fla.region.fit.button.tooltip =Fit
 authoring.fla.new.folder.button =New
Index: lams_central/conf/language/lams/ApplicationResources_en_AU.properties
===================================================================
RCS file: /usr/local/cvsroot/lams_central/conf/language/lams/ApplicationResources_en_AU.properties,v
diff -u -r1.114 -r1.115
--- lams_central/conf/language/lams/ApplicationResources_en_AU.properties	17 Oct 2014 18:40:18 -0000	1.114
+++ lams_central/conf/language/lams/ApplicationResources_en_AU.properties	22 Oct 2014 10:23:28 -0000	1.115
@@ -457,7 +457,8 @@
 authoring.fla.branching.end.suffix =end
 authoring.fla.remove.activity.confirm =Are you sure you want to remove the whole branching activity?
 authoring.fla.branching.create.confirm =Transition from this activity already exists.\\nDo you want to create branching here?
-authoring.fla.transition.to.exists.error =Transition to this activity already exists
+authoring.fla.transition.to.exists.error =Transition to this activity already exists.
+authoring.fla.circular.sequence.error =You are not allowed to have a circular sequence.
 authoring.fla.default.annotation.label.title =Label
 authoring.fla.region.fit.button.tooltip =Fit
 authoring.fla.new.folder.button =New
Index: lams_central/web/authoring/authoring.jsp
===================================================================
RCS file: /usr/local/cvsroot/lams_central/web/authoring/authoring.jsp,v
diff -u -r1.8 -r1.9
--- lams_central/web/authoring/authoring.jsp	17 Oct 2014 18:41:17 -0000	1.8
+++ lams_central/web/authoring/authoring.jsp	22 Oct 2014 10:23:28 -0000	1.9
@@ -52,6 +52,7 @@
 				REMOVE_ACTIVITY_CONFIRM : '<fmt:message key="authoring.fla.remove.activity.confirm" />',
 				BRANCHING_CREATE_CONFIRM : '<fmt:message key="authoring.fla.branching.create.confirm" />',
 				TRANSITION_TO_EXISTS_ERROR : '<fmt:message key="authoring.fla.transition.to.exists.error" />',
+				CIRCULAR_SEQUENCE_ERROR : '<fmt:message key="authoring.fla.circular.sequence.error" />',
 				
 				// DecorationLib
 				DEFAULT_ANNOTATION_LABEL_TITLE : '<fmt:message key="authoring.fla.default.annotation.label.title" />',
Index: lams_central/web/includes/javascript/authoring/authoringActivity.js
===================================================================
RCS file: /usr/local/cvsroot/lams_central/web/includes/javascript/authoring/authoringActivity.js,v
diff -u -r1.39 -r1.40
--- lams_central/web/includes/javascript/authoring/authoringActivity.js	19 Oct 2014 06:28:43 -0000	1.39
+++ lams_central/web/includes/javascript/authoring/authoringActivity.js	22 Oct 2014 10:23:28 -0000	1.40
@@ -849,6 +849,23 @@
 			return;
 		}
 		
+		// check for circular sequences
+		var candidate = fromActivity;
+		do {
+			if (candidate.transitions && candidate.transitions.to.length > 0) {
+				candidate = candidate.transitions.to[0].fromActivity;
+			} else if (candidate.branchingActivity && !candidate.isStart) {
+				candidate = candidate.branchingActivity.start;
+			} else {
+				candidate = null;
+			}
+			
+			if (toActivity == candidate) {
+				alert(LABELS.CIRCULAR_SEQUENCE_ERROR);
+				return;
+			}
+		} while (candidate != null);
+		
 		// branchData can be either an existing branch or a title for the new branch
 		var branch = branchData && branchData instanceof ActivityDefs.BranchActivity ? branchData : null,
 			transition = null;