SAP BPM Process start OData service giving error

Hi,

I am facing the following issue when I try to start process using BPM OData services.

process start data objects are getting appended with symbol "::"

Here I am attaching Process start data response from Odata service

------------------------------------------------------------

"::car": {

                        "__metadata": {

                            "id": "http://cl1-ce4:50100/bpmodata/startprocess.svc/demo.sap.com/carexchange~bpm/CarExchangeFlow/%3A%3Acar('e0e1b8c6ce79c68d842311e48bb1005056972d0a_1')",

                            "uri": "http://cl1-ce4:50100/bpmodata/startprocess.svc/demo.sap.com/carexchange~bpm/CarExchangeFlow/%3A%3Acar('e0e1b8c6ce79c68d842311e48bb1005056972d0a_1')",

                            "type": "BPMProcessStart.::car"

                        },

                        "EDM_Key": "e0e1b8c6ce79c68d842311e48bb1005056972d0a_1",

                        "make": null,

                        "model": null,

                        "year": null,

                        "color": null,

                        "value": null,

                        "name": null,

                        "email": null,

                        "mobile": null,

                        "customerId": null,

                        "managerId": null,

                        "evaluatorId": null,

                        "salesRepId": null

                    }

-----------------------------------------

process xsd object as follows:

-----------------

<xsd:element name="car">

  <xsd:complexType>

  <xsd:sequence>

  <xsd:element name="make" type="xsd:string" />

  <xsd:element name="model" type="xsd:string" />

  <xsd:element name="year" type="xsd:string" />

  <xsd:element name="color" type="xsd:string" />

  <xsd:element name="value" type="xsd:string" />

  <xsd:element name="name" type="xsd:string" />

  <xsd:element name="email" type="xsd:string" />

  <xsd:element name="mobile" type="xsd:string" />

  <xsd:element name="customerId" type="xsd:string" />

  <xsd:element name="managerId" type="xsd:string" />

  <xsd:element name="evaluatorId" type="xsd:string" />

  <xsd:element name="salesRepId" type="xsd:string" />

  </xsd:sequence>

  </xsd:complexType>

  </xsd:element>

--------------------------

so when I invoked odata process start service not considering that strange symbol, getting odata exception as

com.sap.core.odata.api.exception.ODataApplicationException: com.sap.core.odata.api.ep.EntityProviderException: com.sap.core.odata.api.edm.EdmException: java.net.URISyntaxException: Expected scheme name at index 0: ::car

can you please help me why this strange symbol is appended to process start data object?

Thanks

-Trim