a4j:commandButton doesn't render the element - jsf

Question

I've got a JSF page with <rich:tabPanel> which contains 4 tabs.
On the 4th tab I'm trying to use <a4j:commandButton> to execute the action and render resulTable.
Here is the shorten example
<rich:tab header="Journal">
<h:form id="filterForm">
<a4j:jsFunction name="submitByEnter"
action="#{smsLogList.refresh}" render="smsTable" />
<s:div id="divSearch">
<rich:collapsiblePanel header="#{messages['search']}"
switchType="client">
<h:panelGrid column="1">
<s:decorate template="/layout/edit.xhtml">
<ui:define name="label">Package number</ui:define>
<h:inputText id="packNum" style="width:200px"
value="#{smsLogList.packNum}">
<a4j:ajax event="keyup" listener="#{smsLogList.refresh}"
ignoreDupResponses="true" requestDelay="1500"
render="smsTable" />
</h:inputText>
</s:decorate>
<!---some other search elements-->
<s:div styleClass="actionButtons">
<a4j:commandButton id="search" value="#{messages['search']}"
render="smsTable" action="#{smsLogList.go}" />
<a4j:commandButton id="reset" value="#{messages['clear']}"
onclick="document.getElementById('filterForm').reset();"
action="#{smsLogList.clear}" render="divSearch,smsTable" />
</s:div>
</h:panelGrid>
</rich:collapsiblePanel>
</s:div>
<!--- results table-->
<h:panelGrid id="smsTable">
<s:div>
<rich:dataTable value="#{smsLogList.resultList}" var="sms"
id="table" rendered="#{not empty smsLogList.resultList}">
<rich:column>
<f:facet name="header">Type</f:facet>
<h:outputText value="#{sms.smsType}" />
</rich:column>
<!---- some other columns-->
</rich:dataTable>
<rich:dataScroller for="table" />
</s:div>
</h:panelGrid>
</h:form>
</rich:tab>
So, when I'm clicking on the <a4j:commandButton> - nothing happens, but if I'm switching to the other tab and back - the result is as necessary.
I tried to change a4j to <h:commandButton>, but after it's pressed the page switches to the first tab.
Is any solution how to work this out?

Answer 1

The solution is quite simple.
I used <h:form> inside other <h:form>. It will not work anyway. When I remove internal - the jsf works smooth and as it should.