Errors while parsing valid BPMN 2.0 models

I found some valid BPMN 2.0 models that raise an error while loading into a knowledge base.
The models have:

• boundary events attached to an activity task.
• a task with more than one incoming flow
• two tasks with different id's but the parser override one with the other because the parser tries first with an format id like: "_<<parent_context_id>>-<<task_id>>"