docs: @Check(CheckType.FAST)
  	public void checkBehaviorUnitEventType(SarlBehaviorUnit behaviorUnit) {
  		final JvmTypeReference event = behaviorUnit.getName();
  		final LightweightTypeReference ref = toLightweightTypeReference(event);
  		if (ref == null || !this.inheritanceHelper.isSarlEvent(ref)) {
  			error(MessageFormat.format(
  					Messages.SARLValidator_75,
  					event.getQualifiedName(),
  					Messages.SARLValidator_62,
  					this.grammarAccess.getOnKeyword()),
  					event,
  					null,
  					ValidationMessageAcceptor.INSIGNIFICANT_INDEX,
  					TYPE_BOUNDS_MISMATCH);
  		}
  	}