utility1.html

 <af:inputText label="Utility Task Flow Input Parameter" id="it1" 
        value="#{pageFlowScope.inputParameter}"/>
    <af:commandButton text="back" id="cb1" action="back">
      <af:setPropertyListener from="#{pageFlowScope.inputParameter}" 
                              to="#{pageFlowScope.returnValue}"
                              type="action"/>
    </af:commandButton>
    <af:commandButton text="next" id="cb2" action="next">
      <af:setPropertyListener from="#{pageFlowScope.inputParameter}" 
                              to="#{pageFlowScope.returnValue}" 
                              type="action"/>