How to get all items from given type, RTC 6.0.1M1?

Hi, I created a workItem type named "custom" and I want to find all artifacts from from that workItem. So I do GET request using POSTman tool:

https://10.0.2.79:9443/ccm/oslc/contexts/_tsVvMWWwEeWQIIEAtKgWEg/workitems?oslc.where=rtc_cm:type="custom"&oslc.prefix=rtc_cm=<http://jazz.net/xmlns/prod/jazz/rtc/cm/1.0>

But get the error:

<rdf:RDF
   
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   
    xmlns:oslc="http://open-services.net/ns/core#" >
    <rdf:Description rdf:nodeID="A0">
        <oslc:message>Unknown attribute id: [http://jazz.net/xmlns/prod/jazz/rtc/cm/1.0type]</oslc:message>
        <oslc:statusCode>400</oslc:statusCode>
        <rdf:type rdf:resource="http://open-services.net/ns/core#Error"/>
    </rdf:Description>
</rdf:RDF>

Where is my wrong ? How to fix that?