jsf - Cannot click on selected Item when the value is null primefaces -


i have selectonemenu, in xhtml page, when want click in selectitem itemvalue null, there no effect, shows default selection

 <p:selectonemenu id="cout" style="width: 120px;" value="#{servicemanagedbean.selectedservice.coutsmscalc}">                       <f:selectitem itemlabel="sélectionnez une" itemvalue="" />                       <f:selectitem itemlabel="oui" itemvalue="oui" />                         <f:selectitem itemlabel="non" itemvalue="" />                     </p:selectonemenu>

so, when click in itemlabel "non", remains on "sélectionnez une"

try if item value string

<f:selectitem itemlabel="sélectionnez une" itemvalue="{null}" /> <f:selectitem itemlabel="oui" itemvalue="oui" />   <f:selectitem itemlabel="non" itemvalue="non" />

or try if item value boolean

<f:selectitem itemlabel="sélectionnez une" itemvalue="{null}" /> <f:selectitem itemlabel="oui" itemvalue="true" />   <f:selectitem itemlabel="non" itemvalue="false" />

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