I am using POSTER to exercise with REST API. I am using RQM 4.0.6.
1) Create a TestPlan.  this is OK
2) GET the newly created plan in order to get the Etag.
3) PUT  using following request headers
Content-Type                 =   application/rdf+xml
Accept                            =   application/xml
X-Jazz-CSRF-Prevent   =   93E88E2B369FE22E3ED28B95225BE94D  ( from cookies in FF )
If-Match                         =   https://localhost:9443/qm/service/com.ibm.rqm.integration.service.IIntegrationService/resources/Prova2/testplan/_bmbBYR1OEeSc9Zod6rR9Vg <== Etag from the previous GET

I get the following:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><ns4:Error xmlns:ns10="http://jazz.net/xmlns/alm/qm/v0.1/testscript/v0.1/" xmlns:ns11="http://jazz.net/xmlns/alm/qm/qmadapter/task/v0.1" xmlns:ns12="http://jazz.net/xmlns/alm/qm/qmadapter/v0.1" xmlns:ns13="http://jazz.net/xmlns/alm/qm/v0.1/executionworkitem/v0.1" xmlns:ns14="http://jazz.net/xmlns/alm/qm/v0.1/catalog/v0.1" xmlns:ns16="http://jazz.net/xmlns/alm/qm/styleinfo/v0.1/" xmlns:ns17="http://www.w3.org/1999/XSL/Transform" xmlns:ns1="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:ns2="http://jazz.net/xmlns/alm/qm/v0.1/executionresult/v0.1" xmlns:ns3="http://schema.ibm.com/vega/2008/" xmlns:ns4="http://jazz.net/xmlns/alm/qm/v0.1/" xmlns:ns5="http://jazz.net/xmlns/alm/v0.1/" xmlns:ns6="http://purl.org/dc/elements/1.1/" xmlns:ns7="http://jazz.net/xmlns/prod/jazz/process/0.6/" xmlns:ns8="http://purl.org/dc/terms/" xmlns:ns9="http://jazz.net/xmlns/alm/qm/v0.1/tsl/v0.1/"><ns4:statusCode>412</ns4:statusCode><ns4:message>State identifier https://localhost:9443/qm/service/com.ibm.rqm.integration.service.IIntegrationService/resources/Prova2/testplan/_bmbBYR1OEeSc9Zod6rR9Vg is invalid.</ns4:message><ns4:trace>com.ibm.rqm.integration.common.InvalidStateIdentifierException: invalid UUID
    at com.ibm.rqm.integration.handler.AbstractPutHandler.handle(AbstractPutHandler.java:158)
    at com.ibm.rqm.integration.handler.AbstractPostHandler.handle(AbstractPostHandler.java:82)
    at sun.reflect.GeneratedMethodAccessor868.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
    at com.sun.proxy.$Proxy2187.handle(Unknown Source)
    at com.ibm.rqm.integration.service.internal.IntegrationService.handleRequest(IntegrationService.java:626)
    at com.ibm.rqm.integration.service.internal.IntegrationService.perform_PUT(IntegrationService.java:222)
    at com.ibm.team.repository.service.TeamRawService.service(TeamRawService.java:96)
    at sun.reflect.GeneratedMethodAccessor866.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
    at com.sun.proxy.$Proxy1474.service(Unknown Source)
    at com.ibm.team.repository.servlet.AbstractTeamServerServlet.doRestService(AbstractTeamServerServlet.java:909)
    at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest2(AbstractTeamServerServlet.java:2355)
    at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest(AbstractTeamServerServlet.java:2153)
    at com.ibm.team.repository.servlet.AbstractTeamServerServlet.service(AbstractTeamServerServlet.java:1963)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)
    at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
    at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:126)
    at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:76)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.eclipse.equinox.servletbridge.BridgeServlet.service(BridgeServlet.java:120)
    at com.ibm.team.repository.server.servletbridge.JazzServlet.service(JazzServlet.java:74)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.ibm.team.repository.server.servletbridge.BridgeFilter.processDelegate(BridgeFilter.java:165)
    at com.ibm.team.repository.server.servletbridge.BridgeFilter.doFilter(BridgeFilter.java:198)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:336)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:906)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:929)
    at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.IllegalArgumentException: invalid UUID
    at com.ibm.team.repository.common.UUID.valueOf(UUID.java:126)
    at com.ibm.rqm.integration.handler.AbstractPutHandler.handle(AbstractPutHandler.java:155)
    ... 51 more
</ns4:trace></ns4:Error>

OR ( without any action on the server, and using EXACTLY the same POSTER setup

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I'd really appreciate any help,
thank you