Calling an ABCS Requester from a DB Adapter

I have built a standard AIA integration scenario where we have the following processes:
Requestor DB Adapter (pulls data from source system - implemented as an ESB)
Requester ABCS (implemented as BPEL)
EBS Payables Invoice (implemented as an ESB)
Provider ABCS (implemented as BPEL)
Provider DB Adapter (inserting AP Invoices into eBiz)
I'm trying to work out the correct way of Linking the Requestor DB Adapter with the Requester ABCS.
Initially I have done the following (which works but i'm not sure its the correct approach).
The ESB process has a DB Adapter Service and a Routing Service, in this routing service I use the Service explorer to find the deployed BPEL Requester ABCS service and add this routing rule.
This draws the picture as you intend and does actually call the BPEL process at runtime.
However we have had instances where this link (between Routing Service and BPEL process) disappears.
Instead of using the service explorer to add a routing rule, should I instead add a SOAP Service (using the Component Pallet) and configure this to call the BPEL process?
I'm assuming that with my initial implementation if the BPEL process is Undeployed for what ever reason then we could have issues.
Please advise.
Regards
Stuart

Stuart,
You have implemented exactly how it should be. It is recommended to use native bindings between ESB adapter service and BPEL ABCS.
However we have had instances where this link (between Routing Service and BPEL process) disappears.Could you please provide more details? Is your flow failing in some instances?
I'm assuming that with my initial implementation if the BPEL process is Undeployed for what ever reason then we could have issues.Yes, however, IMO you would have many other issues if that happens and undeploy of a service would not happen in a production scenario without reason and planning.
Regards
Rohit

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<?xml version="1.0" encoding="UTF-8"?>
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<?xml version="1.0" encoding="UTF-8"?>
<definitions name="bal_a_process"
targetNamespace="http://bal.request.process/bal_a_process.wsdl"
xmlns="http://schemas.xmlsoap.org/wsdl/"
xmlns:tns="http://bal.request.process/bal_a_process.wsdl"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:xsd1="http://bal.request.process/bal_a_process.xsd" >
<documentation>
WSDL for Service: bal_a_process, generated by Oracle WSDL toolkit (version: 1.1)
</documentation>
<types>
<schema targetNamespace="http://bal.request.process/bal_a_process.xsd" xmlns:tns="http://bal.request.process/bal_a_process.xsd" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:dom="http://xmlns.oracle.com/2001/XMLSchema/DOM">
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<all>
<element name="outresponsexmlOut" type="dom:org.w3c.dom.DocumentFragment"/>
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</schema>
</types>
<message name="processRequestOutput">
<part name="return" type="xsd1:bal_request_process_bal_a_processUser_processRequest_Out"/>
</message>
<message name="processRequestInput">
<part name="param0" type="xsd:string"/>
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<portType name="bal_a_processPortType">
<operation name="processRequest">
<input message="tns:processRequestInput"/>
<output message="tns:processRequestOutput"/>
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</input>
<output>
<soap:body use="encoded" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="urn:bal-request-process-bal_a_process"/>
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</binding>
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<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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</SOAP-ENV:Envelope>
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Regards

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