Import BPMN process failed

Hello colleagues,

I've tried to import a BPMN process into the Gravity tool but I receive a message that states

The following issues were identified while importing the model:

Import model failed :

Cannot import input BPMN model. Please check the file for any inconsistency

I have exported the process from SAP NW 7.31 and I expect it is BPMN compliant. Unfortunatelly I couldn't find out how to attach the process to this report.

Regards,

Mladen