The input message to the compensation service is a snapshot of given variable data at the point in time that the corresponding forward service completed successfully.

Now that you have a clean way to retrieve the list of courses and maintain that data in a context variable managed by Seam, it is time to branch off from the course listing.

For example even though at design time a variable of data type double can be mapped to a table column of type XML, the run time consequences are unpredictable and hence resulting in errors.