[xsl] required parameter

Hi

I have an XSLT problem I don't understand. I pass a value in a parameter to a 
template like so:

<xsl:template match="/" as="element()">
       <div id="languageOption">
              <xsl:sequence select="model:model/model:LanguageOptions" />
              <xsl:apply-templates select="f:action-form('fLanguage', 'Set', 
'Language', 'post')" mode="helper">
                     <xsl:with-param name="language-options" 
select="model:model/model:LanguageOptions" />
              </xsl:apply-templates>
       </div>
</xsl:template>

Which is matched by this template:

<xsl:template mode="helper" match="form[@id = 'fLanguage']">
       <xsl:param name="language-options" required="yes"/>
</xsl:template>

and I get the error: 'No value supplied for required parameter 
$language-options'. Problem is, if I remove the required attribute, the line 
'<xsl:sequence select="model:model/model:LanguageOptions" />' works fine.

Input XML looks like this:

       <model:LanguageOptions>
              <model:SelectListItem>
                     <model:Selected>false</model:Selected>
                     <model:Text>Česky</model:Text>
                     <model:Value>cs-CZ</model:Value>
              </model:SelectListItem>
              <model:SelectListItem>
                     <model:Selected>true</model:Selected>
                     <model:Text>English</model:Text>
                     <model:Value>en-GB</model:Value>
              </model:SelectListItem>
       </model:LanguageOptions>

Any bright ideas?

Thanks

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