Mapping values from an idatacodable object using a flow service

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I have this object in the pipeline:


 <idatacodable name="ExceptionTransitionInfo" javaclass="com.wm.data.BasicIDataCodable">
      <value name="ErrorMessage"></value>
      <value name="SourceStepId">S60</value>
      <value name="SourceStepIteration">4</value>
      <value name="ExceptionType">JoinTimeout</value>
    </idatacodable>

And I would like to map the values from this object to a custom error message using a flow service.

Could anyone provide information about how to map values from an object like this? When I try to map from this object to an ExceptionTransitionInfo document type, I am not getting any data.

Thanks in advance!