row select event on Datatable with partial submit dont work primefaces - jsf

Question

I have prime faces form that have set of input elements and finally button let's call it i_BTN which is not the submit button and datatable let's call it f_DT.
My logic is to fill set of elements let's is call these elements :
inpt_1 and inpt_2 not all elements and when click on i_BTN it is add new record in f_DT.
I am using partial submit in i_BTN to to that logic cause i don't to submit all fields.
Button do its task fine and new record is added in f_DT
My big deal is :
when i am add ajax in f_DT to catch rowSelect the SelectEvent object pass with null value.
with full submit SelectEvent is passed with value.
<h:form id="generalForm">
<p:inputText label="full_submit_input_one" id="inpt1"/>
<p:inputText label="full_submit_input_two" id="inpt2"/>
<h:panelGrid columns="4" id="partial_submit_Panel">
<p:inputText label="partial_submit_input_one" id="inpt3"/>
<p:inputText label="partial_submit_input_two" id="inpt4"/>
</h:panelGrid>
<p:dataTable id="itemDT" var="item" value="#{itemView.items}" selectionMode="multiple"
selection="#{itemView.selectedItems}"
rowKey="#{fee.Id}">
<p:ajax event="rowSelect"
listener="#{dtFeesView.onRowSelect}" />
<p:column headerText="Input three">
<h:outputText value="#{fee.inpt3}" />
    </p:column>
<p:column headerText="Input four">
<h:outputText value="#{fee.inpt4}" />
    </p:column>
</p:dataTable>
<p:commandButton value="Full Submit" actionListener="#{itemView.add}"/>
<p:commandButton value="Partial Submit" actionListener="#{itemView.insertRecord}" process=":generalForm:partial_submit_Panel"/>
#ManagedBean(name="itemView")
#ViewScoped
public class ItemView{
private ItemModel selectedItems[];
// getters and setters for selectedItems
private List<ItemModel> items;
// getters and setters for items
public void add(){
// add item to i.e database
}
public void insertRecord(){
// add itemModels to items list
}
public void onRowSelect(SelectEvent event) {
ItemModel model =(ItemModel)event.getObject();
// model is null in case of process with value :generalForm:partial_submit_Panel
//model is not null in case of process with value generalForm "submit full form"
}
}
please help.
regards.