Start Process connection

The start of the process. A process should have exactly one start node (none start node which does not have event definitions), which cannot have incoming connections and should have one outgoing connection.

In the bpmn modeler Start Event could have more than one node , I would like to know which file should I change to add a connection rule to the StartEvent


Is this a hard rule, written down in the BPMN 2.0 spec or a simple modeling guideline? Could you elaborate from which parts of the BPMN 2.0 spec / other input source you obtained the information from.

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I got this information from jbpm user guide HERE

and when I add a start event on my process it generates exception