combobox Value is not valid

[vata2999]

Hi,

I have 2 combobox that one of them fill based on another, everything works fine but after i select the second combobox and submit the form, i get this error :  value is not valid

form.xhtml

<h:selectOneMenu value="#{requestType}" onchange="this.form.submit()">
    <s:selectItems value="#{requestTypeQuery.resultList}" var="_reqType" label="#{_reqType.title}"  noLabelSelection="-- Please Select --" />
    <s:convertEntity/>
</h:selectOneMenu>

<h:selectOneMenu value="#{requestHome.instance.requestTypeItem}">
    <s:selectItems value="#{requestTypeItemQuery.resultList}" var="_req" label="#{_req.title}"  noLabelSelection="-- Please Select --" />
    <s:convertEntity/>
</h:selectOneMenu>

requestTypeItemQuery.java

RESTRICTION = {"rti.requestType = #{requestType}"}

I notice when the form is posted the second combobox turn to null i think something is wrong with requestType seam instance

WDYT ?

PS : requestType is a seam component instance from Entity Class RequestType which is defined in component.xml