@@ -, +, @@ 
 values
---
 .../modules/univention/connector/__init__.py                   | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
--- a/services/univention-ad-connector/modules/univention/connector/__init__.py	
+++ a/services/univention-ad-connector/modules/univention/connector/__init__.py	
@@ -36,6 +36,7 @@ import string
 import os
 import cPickle
 import types
+import collections
 import random
 import traceback
 import copy
@@ -1061,7 +1062,14 @@ class ucs:
 						else:
 							equal = compare[0] == compare[1]
 						if not equal:
-							ucs_object[ucs_key] = value
+							# This is deduplication of LDAP attribute values for S4 -> UCS.
+							# It preserves ordering of the attribute values which is
+							# important for the handling of `con_other_attribute`.
+							if isinstance(value, list):
+								ucs_object[ucs_key] = list(collections.OrderedDict.fromkeys(value))
+							else:
+								ucs_object[ucs_key] = value
+
 							ud.debug(ud.LDAP, ud.INFO, "set key in ucs-object: %s" % ucs_key)
 				else:
 					ud.debug(ud.LDAP, ud.WARN, '__set_values: no ucs_attribute found in %s' % attributes)
--