except ldap.ALREADY_EXISTS as ex:

					sAMAccountName_attr_value = object['attributes'].get('sAMAccountName')[0]

					objectSid_attr_value = object['attributes'].get('objectSid')[0]

					objectSid = decode_sid(objectSid_attr_value)

					if not (sAMAccountName_attr_value and objectSid):

						raise	## unknown situation

					filter_s4 = '(&(sAMAccountName=%s)(objectSid=%s)(isDeleted=TRUE))' % (sAMAccountName_attr_value, objectSid)

					ud.debug(ud.LDAP, ud.WARN, "sync_from_ucs: Error during add, searching for conflicting deleted object in S4. Filter: %s" % filter_s4)

					result = self.lo_s4.lo.search_ext_s(self.lo_s4.base,ldap.SCOPE_SUBTREE, filter_s4, ['dn'], serverctrls=[LDAPControl(LDAP_SERVER_SHOW_DELETED_OID, criticality=1), LDAPControl(LDB_CONTROL_DOMAIN_SCOPE_OID, criticality=0)])

					if not result or len(result)>1:	## the latter would indicate corruption

						ud.debug(ud.LDAP, ud.WARN,"sync_from_ucs: No conflicting object found.")

						raise	## unknown situation

					ud.debug(ud.LDAP, ud.INFO,"sync_from_ucs: Ok, deleting conflicting object: %s"% result[0][0])

					self.lo_s4.lo.delete_ext_s(compatible_modstring(result[0][0]),  serverctrls=[LDAPControl(LDB_CONTROL_RELAX_OID, criticality=0)])

					## and try again

					try:

						self.lo_s4.lo.add_ext_s(compatible_modstring(object['dn']), compatible_addlist(addlist), serverctrls=ctrls) #FIXME encoding

					except:

						ud.debug(ud.LDAP, ud.ERROR, "sync_from_ucs: traceback during add object: %s" % object['dn'])

						ud.debug(ud.LDAP, ud.ERROR, "sync_from_ucs: traceback due to addlist: %s" % addlist)

						raise