Facing issues while working Rosettanet PIP3A4 Manage Purchase Order process

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I am working on PIP3A4 Manage Purchase Order process using Rosettanet. This Purchase process is "Two-action asynchronous’.I am facing the following problems

  1. In order to send the document to Trading Networks(TN), ‘pub.estd.rosettaNet:receive’ service is required. But this service, in my case doesnt have Inputs and Outputs at all.
    How can we get the service(pub.estd.rosettaNet:receive)which has Input and output ? is there any other way of sending a Rosettanet document to TN.
  2. We are using Process Model to implement this scenario.The process created requires a “Wait for PORequest” activity step. This step uses “pub.estd.rosettaNet:waitStepInit” service.The process model got successfully “Built and Uploaded for execution”.I enabled the process model using the Monitor.But while running the process at the “Wait for PORequest” activity step, there was an error thrown saying “com.wm.estd.rosettaNet.prt.CouldNotIdentifyTheIncommingDocType: Could not find any entry document in this wait step”.
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What is the first step in your 3A4 process model? You need to have a receive step, to trigger the process model. Please ensure that your receive step is subscribed to the Pip 3A4 purchase order request doc type.