<p:ajax> update not working primefaces 4.0 to 6.2 Migration

[fes]

<p:selectOneMenu id="ddl_district"
value="#{village_Entry.ddl_district}"
valueChangeListener="#{village_Entry.ddl_district_changed}"
styleClass="component-width">

<f:selectItems value="#{village_Entry.ddl_district_options}"/>

<p:ajax event="change"
Process="ddl_district"
Update="ddl_taluka"/>

</p:selectOneMenu>

public void ddl_district_changed(ValueChangeEvent event) {
ddl_district = event.getNewValue().toString();
setDdl_taluka();
}

[kukeltje]

Great, some code but totally no text...

For others: issue already got attention here: https://stackoverflow.com/questions/504 ... -migration