[ZPT] Weird ZPT macro bug

[Andreas Jung]

I have defined the following working macro
          
    <div metal:define-macro="transcript_plain">
      <p tal:repeat="entry here/transcript">
        <pre tal:content="entry/getComment"> </pre>
      </p>
    </div>

When I replace the 'pre' tag by a 'div' tag
          
    <div metal:define-macro="transcript_plain">
      <p tal:repeat="entry here/transcript">
        <div tal:content="entry/getComment"> </div>
      </p>
    </div>

I get the following error:
                                                                                                                      
Error Type: TALESError
Error Value: Products.PageTemplates.PageTemplate.PTRuntimeError on Page Template collector_macros has errors. in "standard:'here/collector_macros/macros/issue_header'", at line 12, column 3 

The error occurs in the template where I am calling the macro.
Is this some kind of side effect?

Andreas