Error Propagation
Groups and called processes define the scope of an exception. An exception that occurs within a group or a called process causes processing to halt. Any unhandled exceptions are propagated to the next highest exception scope. Unhandled errors occur where there is no error transition or Catch activity that specifies the activities to execute in the case of an error.
Also, you can use the Generate Error activity to create an unhandled error. The Generate Error activity does not permit any transitions to another activity, so any error created by the Generate Error activity is propagated to the next highest exception scope.
The following sections describe propagation of errors for groups and called processes.