1. Create/Open Business Process Start->Manual Task->End
2. Add to canvas Catching Intermediate Message Event
3. Add value to documentation property
4. Save and Reopen Business Process
5. Check Documentation property of Message Event (it is NOT empty)
6. Attach Event to Manual task
7. Check Documentation property of Message Event (it is NOT empty)
8. Save and Reopen Business Process
9. Check Documentation property of Message Event (it IS empty)