I'm using Primefaces 3.5 5th December 2012 SNAPSHOT, with Mojarra 2.1.14 and Tomcat 7.0.33.
When using the in-cell editing mode (not in-row) for POJO objects with a model/entity class that are represented in a h:selectOneMenu, with 'click' as the celleditevent value, whenever you click on an object and then 'click away' by clicking on some other object, the previous object is displaying its value instead of its label. This is only 'cosmetic' as when you reload the page, it will show the label value.
<p:dataTable id="insurancepolicyTable" var="insurancepolicy" widgetVar="insurancepolicyList" value="#{insurancepolicybean.objectList}" paginator="true" rows="15" paginatorPosition="bottom" paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}" currentPageReportTemplate="#{text['table.insurancepolicy.filter.count']}" rowsPerPageTemplate="15,25,50,100" emptyMessage="#{text['table.insurancepolicy.filter.notfound']}" filteredValue="#{insurancepolicybean.filteredObject}" editable="true" editMode="cell" cellEditEvent="click" draggableColumns="true" rowKey="#{insurancepolicy.id}" >
<p:column id="branchColumn" headerText="#{text['label.branch']}" sortBy="#{insurancepolicy.branch.name}" filterBy="#{insurancepolicy.branch.name}" filterMatchMode="contains">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{insurancepolicy.branch.name}" />
</f:facet>
<f:facet name="input">
<div class="ui-inputfield ui-inputtext ui-widget ui-state-default ui-corner-all">
<p:selectOneMenu id="branchselectinsurancepolicylist" value="#{insurancepolicy.branch}" styleClass="customSelect" converter="omnifaces.SelectItemsIndexConverter">
<f:selectItems value="#{insurancepolicybean.branchList}" var="branch" itemLabel="#{branch.name}" itemValue="#{branch}" />
</p:selectOneMenu>
</div>
</f:facet>
</p:cellEditor>
</p:column>
<p:ajax event="cellEdit" listener="#{insurancepolicybean.onEdit}" update="@form" />
<pe:resetInput event="cellEdit" for="@form" />
</p:dataTable>