autoyast unable to interpret dns name for ntp server

NTP configuration in autoyast file

<edirectory>
<ntp_server config:type="list">
<listentry>ntp.server.ntp-server.us</listentry>
</ntp_server>
</edirectory>

Error in the y2log:

2011-02-30 12:23:55 <3> linux(5244) [Interpreter] Edirectory.ycp:5100 Can't
convert value '["ntp.server.ntp-server.us"]' to type 'string'nn
2011-02-30 12:23:55 <1> linux(5244) [YCP] clients/edirectory_auto.ycp:107
Edirectory auto finished