Compensation boundary catch events can neither be attached nor be linked to subprocess.

1. Draw a simple process flow with 2 subprocesses (S1, S2). 2. Put a 'throw intermediate compensation' event after S1. 3. Try to attach a 'catch boundary compensation' event to S1 - this will throw validation error mentioning "Compensation Boundary Event [] must be attached to a task or sub-process." 4. After this error is fixed, try to link 'catch boundary compensation' event to S2 - this will throw validation error mentioning "An Activity [] associated with a Boundary Compensation Event must be a Task or a (non-Event) Sub-Process".