Kumar,
If you have access to the subscribing side and you’re allowed to edit the code, then you can add a savePipelineToFile step at the beginning of the service to capture what your service is receiving. Once a transaction comes through, you can use restorePipelineFromFile to step through your service.
Now, if you believe the publisher is not publishing the document or your trigger is not receiving the document, then I’d suggest looking at the Broker Admin and looking at some of the statistics there (ex.: last time document was published, last time document was received, etc.) You can also look at the Service Usage on the Administrator console to see if your service is actually being executed.
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