added issue ref

Issue #550406

Change-Id: I4e9afda329fa84a007c1ceb1dcdbbc0c93a77f20
Signed-off-by: Ralph Soika <ralph.soika@imixs.com>
diff --git a/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/validation/validators/GatewayValidator.java b/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/validation/validators/GatewayValidator.java
index 8a6e120..e8a9db8 100644
--- a/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/validation/validators/GatewayValidator.java
+++ b/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/validation/validators/GatewayValidator.java
@@ -36,6 +36,8 @@
  * <li>Unspecified gateways MUST have either multiple incoming, or multiple outgoing connections</li>
  * </ul>
  * 
+ * Issues: #550406
+ * 
  */
 public class GatewayValidator extends AbstractBpmn2ElementValidator<Gateway> {