<p:ajax update=""> inside nested components - ajax

Question

Iam using Mojarra 2.2.11 (WildFly 9.0.1) with PF 5.3.
In relation with my original question:
<p:ajax update="...> cell or row update inside PF subTable
I am still struggling with the following line: <p:ajax update=":tabView1:form1:mainTable".../>
The following part has been changed: #{subTableView.getAllheaders(tabview)}. Below references have been used but the datatable refresh does not seem to work.
I have done several researches and tried multiple options without success.
The operation looks easy: I need to process a selectOneRadio value to update the outputLabel in the next column of the datatable. I am not getting any error: but the radio selection comes back to the initial position when another radio is clicked without updating the outputlabel.
I paid attention that outputLabel is surrounded by a panelGroup (see reference). NamingContainer with proper syntax has been tried:
BalusC ref: How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"
I tried with RequestContext#update("tabView1:form1:mainTable:panel") with the below references:
Primefaces p:ajax listener conditional update
PF Showcase
<f:ajax execute="" render=""/> has been tried
Reference: Mastering JSF 2.2 Book
I was thinking about the last jQuery option but I still think it is doable with JSF.
Thank you for your time.
<p:tabView id ="tabView1" value="#{bean.titles}" var="tabItem" >
<p:tab id="tab1" title="#{tabItem}" >
<h:form id="form1" >
<p:dataTable id="mainTable" value="#{subTableView.getAllHeaders(tabItem)}" var="head" >
<p:subTable id="subTable1" value="#{head.questions}" var="question" >
<f:facet name="header">
#{head.name}
</f:facet>
<p:column id="questionColumn">
#{question.question}
</p:column>
<p:column id="radioColumn">
<p:selectOneRadio id="mainSelect" value="#{question.select1}" >
<f:selectItem itemLabel="Yes" itemValue="#{question.responseOfYes}" />
<f:selectItem itemLabel="No" itemValue="#{question.responseOfNo}" />
// here is my pain:
<p:ajax update=":tabView1:form1:mainTable" process="#this"
listener="#{subTableView.updateSecond(question.select1)}"/>
</p:selectOneRadio>
</p:column>
<p:column id="responseColumn">
<h:panelGroup id="panel" >
<h:outputLabel id="display1" value="#{question.select1}" />
</h:panelGroup>
</p:column>
</p:subTable>
</p:dataTable>
</h:form>
</p:tab>
</p:tabView>