Missing output variable specification

Hi there,
I am trying to put in place a one way BPEL process, which receive the invocation from the Mediator component and do not expect any response from the process. I get this error during compilation:
Buildfile: /opt/oracle-jdev/bea-home/jdeveloper/bin/ant-sca-compile.xml
scac:
[scac] Validating composite "/home/alessandro/Work-Space/JDeveloperProject/SOA-POC/trunk/AuditService/composite.xml"
[scac] Setting BPELC option 'classpath' to /opt/oracle-jdev/bea-home/jdeveloper/jdev/extensions/oracle.sca.modeler.jar:/opt/oracle-jdev/bea-home/jdeveloper/soa/modules/oracle.soa.fabric_11.1.1/fabric-runtime.jar:/opt/oracle-jdev/bea-home/jdeveloper/soa/modules/oracle.soa.mgmt_11.1.1/soa-infra-mgmt.jar:/opt/oracle-jdev/bea-home/oracle_common/modules/oracle.fabriccommon_11.1.1/fabric-common.jar:/opt/oracle-jdev/bea-home/jdeveloper/soa/modules/oracle.soa.bpel_11.1.1/orabpel.jar:/opt/oracle-jdev/bea-home/jdeveloper/soa/modules/oracle.soa.mediator_11.1.1/mediator_client.jar:/opt/oracle-jdev/bea-home/oracle_common/modules/oracle.mds_11.1.1/mdsrt.jar::/home/alessandro/Work-Space/JDeveloperProject/SOA-POC/trunk/AuditService/SCA-INF/classes
[scac] FATAL_ERROR: in BPELProcess.bpel(107): output variable not defined
[scac] <invoke/> missing output variable specification
[scac] Make sure to use attribute outputVariable to specify the output message
BUILD FAILED
/opt/oracle-jdev/bea-home/jdeveloper/bin/ant-sca-compile.xml:236: Java returned: 1 Check log file : /home/alessandro/Work-Space/JDeveloperProject/SOA-POC/trunk/AuditService/SCA-INF/classes/scac.log for errors
Total time: 9 seconds
BPEL
<?xml version = "1.0" encoding = "UTF-8" ?>

<process name="BPELProcess"
targetNamespace="http://xmlns.oracle.com/SOA_POC_jws/AuditService/BPELProcess"
xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
xmlns:client="http://xmlns.oracle.com/SOA_POC_jws/AuditService/BPELProcess"
xmlns:ora="http://schemas.oracle.com/xpath/extension"
xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
xmlns:ns1="http://xmlns.oracle.com/pcbpel/adapter/db/SOA-POC/AuditService/AuditDB%2F"
xmlns:bpelx="http://schemas.oracle.com/bpel/extension"
xmlns:ns2="http://xml.virtual-lab.eu/schema/poc-soa/audit/def"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ns3="http://xmlns.oracle.com/pcbpel/adapter/db/top/AuditDB"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<partnerLinks>

<partnerLink name="bpelprocess_client" partnerLinkType="client:BPELProcess" myRole="BPELProcessProvider"/>
<partnerLink name="AuditDB" partnerRole="AuditDB_role"
partnerLinkType="ns1:AuditDB_plt"/>
</partnerLinks>

<variables>

<variable name="inputVariable" messageType="client:BPELProcessRequestMessage"/>
<variable name="Invoke_AuditDB_insert_InputVariable"
messageType="ns1:LogCollection_msg"/>
<variable name="outputVariable" type="xsd:string"/>
</variables>

<sequence name="main">

<receive name="receiveInput" partnerLink="bpelprocess_client" portType="client:BPELProcess" operation="process" variable="inputVariable" createInstance="yes"/>
<assign name="Assign_Payload">
<copy>
<from variable="inputVariable" part="payload"
query="/ns2:add/ns2:executionTime"/>
<to variable="Invoke_AuditDB_insert_InputVariable" part="LogCollection"
query="/ns3:LogCollection/ns3:Log/ns3:when"/>
</copy>
<copy>
<from variable="inputVariable" part="payload"
query="/ns2:add/ns2:onSys/@ns2:which"/>
<to variable="Invoke_AuditDB_insert_InputVariable" part="LogCollection"
query="/ns3:LogCollection/ns3:Log/ns3:whichSys"/>
</copy>
<copy>
<from variable="inputVariable" part="payload"
query="/ns2:add/ns2:fromUser"/>
<to variable="Invoke_AuditDB_insert_InputVariable" part="LogCollection"
query="/ns3:LogCollection/ns3:Log/ns3:who"/>
</copy>
<copy>
<from variable="inputVariable" part="payload"
query="/ns2:add/ns2:usingClient"/>
<to variable="Invoke_AuditDB_insert_InputVariable" part="LogCollection"
query="/ns3:LogCollection/ns3:Log/ns3:whichClient"/>
</copy>
<copy>
<from variable="inputVariable" part="payload"
query="/ns2:add/ns2:fromIP"/>
<to variable="Invoke_AuditDB_insert_InputVariable" part="LogCollection"
query="/ns3:LogCollection/ns3:Log/ns3:ipClient"/>
</copy>
<copy>
<from variable="inputVariable" part="payload"
query="/ns2:add/ns2:callingWS_Operation"/>
<to variable="Invoke_AuditDB_insert_InputVariable" part="LogCollection"
query="/ns3:LogCollection/ns3:Log/ns3:wsOperation"/>
</copy>
</assign>
<invoke name="Invoke_AuditDB"
inputVariable="Invoke_AuditDB_insert_InputVariable"
partnerLink="AuditDB" portType="ns1:AuditDB_ptt"
operation="insert"/>
<terminate name="Terminate"/>
</sequence>
</process>
Could anyone explain me why the compiler expects an output variable and why it doesn't work anyway.
Thanks in advance
Alessandro I

Looks like you deleted the the response back from the client.
If you want to fire and forget BPEL process create an empty BPEL process or an async process. Don't delete the callback in the async process. If the client isn't listening then nothing will happen.
also why is your last step a terminate, this will force all process to have a status of fail.
cheers
James

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