The following code is used in the first column of a datatable (it's an edit link)

<a4j:commandLink limitToList="true"
 reRender="...."
 actionListener="#{bb.dataAction}"
 oncomplete="showReq()">
 <f:verbatim> Edit </f:verbatim>
 <f:param name="requestIdToEdit" value="#{req.id}" />
 <f:param name="requestTypeToEdit" value="#{req.requestType.code}" />
</a4j:commandLink>

It thows a duplicate component id when clicked. If I remove the second parameter, everything works fine. Explicitly setting an id doesn't help, neither does replacing it with a4j:Commandlink.

Is this a bug or am I doing something wrong?