Unable to put a Testcell Artifact (RQMURLUtility)

Hello,

I've some problems putting a testcell with the RQMURLUtility. The first command is a GET request for retrieving the right XML:

java -jar RQMUrlUtility.jar -command GET -user ****** -password ****** -filepath data.xml -url https://******:9443/jazz/secure/service/com.ibm.rqm.integration.service.IIntegrationService/resources/Quality+Manager/testcell/TE1

the result of course is a xml file containing the Testcell with id TE1.
But when I try to execute the PUT request:

java -jar RQMUrlUtility.jar -command PUT -user ****** -password ****** -filepath data.xml -url https://******:9443/jazz/secure/service/com.ibm.rqm.integration.service.IIntegrationService/resources/Quality+Manager/testcell/TE1

this is the result:

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<<<<<RQMUrlUtility>>>>>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

RQMUrlUtility: Connected to https://******:9443 using project "Quality+Manager"
22-lug-2011 12.37.47 org.apache.commons.httpclient.HttpMethodDirector isRedirectNeeded
INFO: Redirect requested but followRedirects is disabled
RQMUrlUtility: Calling method to upload XML from a specified file to URL
RQMUrlUtility: Server Response code: 400
22-lug-2011 12.37.47 org.apache.commons.httpclient.HttpMethodBase getResponseBody
WARNING: Going to buffer response body of large or unknown size. Using getResponseBodyAsStream instead is recommended.

a BadRequest error is thrown. Does someone have the same problem? what is the solution? what I'm doing wrong?