Error while importing csv file  

Hi,
there is some problem with importing processes with nested gates in csv format. Example below.
**Process** 
Order,Activity,Condition,Who,Subprocess,Terminated
0,start,,,,
1,,,,,
2a1,,,,,
2a2,,,,,
2b1a,,,,,
2b1b,,,,,
2b2,,,,,
3,,,,,yes

**Error**
BpmnPythonError: 'Exporting to CSV format accepts only one start event'