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diff --git a/rt/lib/RT/GroupMember_Overlay.pm b/rt/lib/RT/GroupMember_Overlay.pm
index 1cc0309f4..efaa3c7d0 100644
--- a/rt/lib/RT/GroupMember_Overlay.pm
+++ b/rt/lib/RT/GroupMember_Overlay.pm
@@ -1,40 +1,40 @@
 # BEGIN BPS TAGGED BLOCK {{{
-# 
+#
 # COPYRIGHT:
-#  
-# This software is Copyright (c) 1996-2007 Best Practical Solutions, LLC 
-#                                          <jesse@bestpractical.com>
-# 
+#
+# This software is Copyright (c) 1996-2011 Best Practical Solutions, LLC
+#                                          <sales@bestpractical.com>
+#
 # (Except where explicitly superseded by other copyright notices)
-# 
-# 
+#
+#
 # LICENSE:
-# 
+#
 # This work is made available to you under the terms of Version 2 of
 # the GNU General Public License. A copy of that license should have
 # been provided with this software, but in any event can be snarfed
 # from www.gnu.org.
-# 
+#
 # This work is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # General Public License for more details.
-# 
+#
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 # 02110-1301 or visit their web page on the internet at
-# http://www.gnu.org/copyleft/gpl.html.
-# 
-# 
+# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
+#
+#
 # CONTRIBUTION SUBMISSION POLICY:
-# 
+#
 # (The following paragraph is not intended to limit the rights granted
 # to you to modify and distribute this software under the terms of
 # the GNU General Public License and is only of importance to you if
 # you choose to contribute your changes and enhancements to the
 # community by submitting them to Best Practical Solutions, LLC.)
-# 
+#
 # By intentionally submitting any modifications, corrections or
 # derivatives to this work, or any other work intended for use with
 # Request Tracker, to Best Practical Solutions, LLC, you confirm that
@@ -43,8 +43,9 @@
 # royalty-free, perpetual, license to use, copy, create derivative
 # works based on those contributions, and sublicense and distribute
 # those contributions and any derivatives thereof.
-# 
+#
 # END BPS TAGGED BLOCK }}}
+
 =head1 NAME
 
   RT::GroupMember - a member of an RT Group
@@ -65,11 +66,6 @@ doing something wrong.
 =head1 METHODS
 
 
-=begin testing
-
-ok (require RT::GroupMember);
-
-=end testing
 
 
 =cut
@@ -138,10 +134,12 @@ sub Create {
         my $member_object = $args{'Member'}->Object;
         if ($member_object->HasMemberRecursively($args{'Group'})) {
             $RT::Logger->debug("Adding that group would create a loop");
+            $RT::Handle->Rollback() unless ($args{'InsideTransaction'});
             return(undef);
         }
         elsif ( $args{'Member'}->Id == $args{'Group'}->Id) {
             $RT::Logger->debug("Can't add a group to itself");
+            $RT::Handle->Rollback() unless ($args{'InsideTransaction'});
             return(undef);
         }
     }
@@ -174,6 +172,14 @@ sub Create {
     # find things which have the current group as a member. 
     # $group is an RT::Principal for the group.
     $cgm->LimitToGroupsWithMember( $args{'Group'}->Id );
+    $cgm->Limit(
+        SUBCLAUSE => 'filter', # dont't mess up with prev condition
+        FIELD => 'MemberId',
+        OPERATOR => '!=',
+        VALUE => 'main.GroupId',
+        QUOTEVALUE => 0,
+        ENTRYAGGREGATOR => 'AND',
+    );
 
     while ( my $parent_member = $cgm->Next ) {
         my $parent_id = $parent_member->MemberId;