diff --git a/playground/rmgi/complex/messages.bpmn b/playground/rmgi/complex/messages.bpmn
index c4e3b7c2..b17f381c 100644
--- a/playground/rmgi/complex/messages.bpmn
+++ b/playground/rmgi/complex/messages.bpmn
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" id="Definitions_96f6665" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="3.0.0-dev">
+<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:spiffworkflow="http://spiffworkflow.org/bpmn/schema/1.0/core" id="Definitions_96f6665" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="3.0.0-dev">
   <bpmn:collaboration id="Collaboration_1om1e18">
     <bpmn:participant id="Participant_0y2bxwp" processRef="Process_swgepq9" />
   </bpmn:collaboration>
@@ -23,7 +23,11 @@
     </bpmn:endEvent>
     <bpmn:sequenceFlow id="Flow_191jn15" sourceRef="Event_19kx2iz" targetRef="Event_1thmwwn" />
   </bpmn:process>
-  <bpmn:message id="Message_06vehum" name="test" />
+  <bpmn:message id="Message_06vehum" name="test">
+    <bpmn:extensionElements>
+      <spiffworkflow:messagePayload>0</spiffworkflow:messagePayload>
+    </bpmn:extensionElements>
+  </bpmn:message>
   <bpmndi:BPMNDiagram id="BPMNDiagram_1">
     <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Collaboration_1om1e18">
       <bpmndi:BPMNShape id="Participant_0y2bxwp_di" bpmnElement="Participant_0y2bxwp" isHorizontal="true">