[Exist-open] update insert problem with rest interface

[mzha <min...@de...>]

Hi all,
my current version of eXist is 1.2.0.
I am trying to insert a new element into a existing document. My XQuery
works well with the Sandbox but it does not work in my code, which works
with Rest interface. Hier is a snapshot of my code.
xquery="<query xmlns='http://exist.sourceforge.net/NS/exist'>
    <text>declare default element namespace 'http://www.mynamespace'; update
insert
            <businessLog xmlns='http://www.mynamespace'>
            <actorAccessRecord>
                <read id='1' version='1'>
                    <timeStamp>2008-04-14T10:34:15</timeStamp>
                </read>
                <write id='1' version='12'>
                    <timeStamp>2008-04-14T10:34:15</timeStamp>
                </write>
            </actorAccessRecord>
        </businessLog> into
observationContext[observationContextKey/statisticsID='0001' and
        observationContextKey/referencePeriod='020060000' and
        observationContextKey/observationUnitID='01001003' and
       
observationContextKey/collectingUnitID='06']/messageResource[@id='222222222'
and
        @version='1']</text>
</query>";
PostMethod method = new PostMethod(this.hostURL + "/" + collection);
httpMethod.setRequestHeader("Authorization", "Basic " + this.credentials);
httpMethod.setRequestEntity(new StringRequestEntity(xquery, "text/xml",
"UTF-8"));
statusCode = httpMethod.execute(new HttpState(), httpConnection);

I've got '202' as HTTP status code back and in exist.log file it points to
DEBUG (XQuery.java [compile]:129) - org.exist.xquery.XPathException:
err:XPST0003 in line 1, column 96: unexpected token: observationContext
When I use XUpdate instead, I've got the same status code back and in
exist.log file and I didn't find any error message.
I am frustrated. I don't understand why update-insert works well in Sandbox
but not in my code; furthermore why other updates variants like
update-delete and update-replace works well in my code, but update-insert
not.
Please help.
Thank you in advance.
ming
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