Siebel 3.0 Adpater: Workflow and Integration Objects

Adapter: 3.0
Siebel Version: 7.5.3
Integration Server: 6.1

We are currently developing workflows that utilize custom Business Services and the webMEthods EAI transports to communicate with the Siebel Adapter. Currently, we are passing data through the Workflow using Property Sets. We would like to encapsulate this information into a Siebel Message and pass the Siebel Message to the Adpater. Ideally we would pass the Adapter required fields and the Siebel message as the child property. However, we are having trouble getting the adapter to recognize this format.

Has anyone utilized Siebel integration objects and siebel messages to pass data to the webMethods Adapters?