You can use a special semantic check to verify your BPMN diagrams. This semantic check verifies whether a model complies with the modeling conventions for BPMN 2.0.
Procedure (quick video)
The Semantic Check Wizard guides you through the relevant steps.
Tip
If you want a detailed output of the modeling errors, start the Validation of a BPMN diagram (BPMN 2.0) semantic check.