EBS-OTM Integration : Unable to invoke IntGtmXmlService

Hi,

I am trying to invoke IntGtmXmlService using BPEL. But I face the below error while calling the IntGtmXmlService WSDL.

<fault>
<bpelFault>
<faultType>0</faultType>
<remoteFault>
<part name="summary">
<summary>Unknown exception, internal system processing error.</summary>
</part>
<part name="detail">
<detail>javax.xml.ws.soap.SOAPFaultException: Unknown exception, internal system processing error.</detail>
</part>
<part name="code">
<code>env:Server</code>
</part>
</remoteFault>
</bpelFault>
</fault>
<faultType>

Below are the version details :

OTM : 6.3.1
EBS : R11
JDev version : 11.1.1.5.0

I dunno what is wrong. Please respond.

Thanks
HV