If a reference to a part of a web service envelope is greater than 128 characters in a calculate step option or a mapping in an orchestration workflow, running a compare on the process app with cause Composer to crash.
If the default behavior is to map the system fields then composer should just show those fields as being mapped by default and if the user un-maps all the system fields then I would expect none of the system fields to be mapped when the transition is run.
