treelevel <= 2 (Should be 3 tasks)

No. Name Start End
1. Task 1.2 2003-01-01 00:00 2003-01-01 00:00
2. Task 1.1 2003-01-01 00:00 2003-01-01 00:00
3. Task 1 2003-01-01 00:00 2003-01-01 00:00