WebSphere DataPower processing actions that can affect message counts in ITCAM SOA

Question

The ITCAM for SOA data collector monitors DataPower services and the metrics collected are summarized in the Tivoli Enterprise Portal (TEP) in the Services Management Agent Environment workspace. The DataPower Web Services Management (WSM) agent status shows the current state of the interface between DataPower and the ITCAM for SOA data collector. The status includes, Records Seen, the number of transactions for which metrics have been collected. When a single transaction is processed in DataPower, the DataPower WSM agent status will reflect an increment in the Records Seen count. For example, if the Records Seen is 10,000 and a new transaction is processed, the Records Seen will increment to 10,001. Information on that same transaction will eventually be displayed in TEP. In the TEP Navigator Physical View, beneath the Services Management Agent Environment node, is the Message Summary workspace. This workspace provides the details on message counts. Why can the number of messages for a single DataPower transaction be higher than expected; that is, the Records Seen on DataPower will increment by one for a single transaction, why does the TEP Message Summary count increase by more than one for that same transaction?