Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/Group.java
===================================================================
diff -u -rf05e48f6f771c7d2f898aa3a95f3098494f141b2 -r01349ae55aa04376236920a2314eda93d93d5f6d
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/Group.java	(.../Group.java)	(revision f05e48f6f771c7d2f898aa3a95f3098494f141b2)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/Group.java	(.../Group.java)	(revision 01349ae55aa04376236920a2314eda93d93d5f6d)
@@ -374,18 +374,12 @@
 		return entry;
     }
     
-    /** Remove the branch with which this group is associated.
+    /** 
+     * Remove the branch with which this group is associated.
+     * Actually calls the SequenceActivity to do the removal as it is the SequenceActivity that has the hibernate cascade.
+     * So its the activity that must be saved, not the group. Method left here to make it easier to find.
      */
     public void removeGroupFromBranch(SequenceActivity branch) {
-    	if ( getBranchActivities() != null ) {
-    		Iterator iter = getBranchActivities().iterator();
-    		while (iter.hasNext()) {
-				BranchActivityEntry object = (BranchActivityEntry) iter.next();
-				if ( object.getBranchSequenceActivity().equals(branch) ) {
-					iter.remove();
-				}
-			}
-    	}
-    	// branch.getGroupsForBranch().remove(this);
+    	branch.removeGroupFromBranch(this);
     }
 }
Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/SequenceActivity.java
===================================================================
diff -u -rcbb6dc551eb67fef11ac75737d475fb00dcae138 -r01349ae55aa04376236920a2314eda93d93d5f6d
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/SequenceActivity.java	(.../SequenceActivity.java)	(revision cbb6dc551eb67fef11ac75737d475fb00dcae138)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/SequenceActivity.java	(.../SequenceActivity.java)	(revision 01349ae55aa04376236920a2314eda93d93d5f6d)
@@ -260,5 +260,21 @@
     	return listOfValidationErrors;
     }
     
+    /** 
+     * Remove the entry mapping the given group to this branch.
+     * Need to remove it from the branch end, as it is the branch end that 
+     * has the all-delete-orphan cascade (LDEV-1766)
+     */
+    public void removeGroupFromBranch(Group group) {
+    	if ( getBranchEntries() != null ) {
+    		Iterator iter = getBranchEntries().iterator();
+    		while (iter.hasNext()) {
+				BranchActivityEntry object = (BranchActivityEntry) iter.next();
+				if ( object.getGroup().equals(group) ) {
+					iter.remove();
+				}
+			}
+    	}
+    }
 
 }