jsf - f:setPropertyActionListener can not set the property -

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i trying set value of backingbeans property via

    <f:setpropertyactionlistener value="#{customer}"                             target="#{customersviewbean.selectedcustomer}" />

but not set value.it surprising have initialized property in class when pushed command link, set null , gives null pointer exception.do have idea wrong?

    <p:datalist id="datalist5"                 value="#{customersviewbean.filteredpositioncustomer}"                 rendered="#{customersviewbean.positionagoreliste}"                 var="customer">                 <p:column style="padding-bottom:1px!important;">                     <p:commandlink id="commandlink"                          action="#{customersviewbean.getcustomerdetail}">                         <f:setpropertyactionlistener value="#{customer}"                             target="#{customersviewbean.selectedcustomer}" />                         <f:setpropertyactionlistener value="false"                             target="#{customersviewbean.comingfromopportunitydetailtoaddresslist}" />                          <h3>#{customer.name}</h3>                      </p:commandlink>                  </p:column>             </p:datalist>


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