What is correct syntax for dvm inside when clause in xsl transformation?

Question

I'm struggling to manage a DVM inside a when clause in XSLT transformation file:

<xsl:for-each >
  <xsl:choose>
    <xsl:when test='dvm:lookupValue("mapping.dvm","MansioneId",bpws:getVariableData("/ns1:EBM_PersonnelInfo/ns1:Employee/ns1:Role/ns2:Job/ns2:JobID"),"Flag","0") = "Y"'>

Bpel fails with this error:

<bpelFault><faultType>0</faultType><subLanguageExecutionFault xmlns="http://schemas.oracle.com/bpel/extension"><part name="summary"><summary>XPath expression failed to execute. An error occurs while processing the XPath expression; the expression is ora:doXSLTransformForDoc('xsl/Transformation.xsl', $inputVariable.payload). The XPath expression failed to execute; the reason was: javax.xml.transform.TransformerException: oramds:/deployed-composites/default/PersonnelInfo4.9/xsl/Transformation.xsl&lt;Line 161, Column 28>: XML-22015: (Error) Function 'getVariableData' not found.. Check the detailed root cause described in the exception message text and verify that the XPath query is correct. </summary></part><part name="code"><code>XPathExecutionError</code></part></subLanguageExecutionFault></bpelFault>

Is the getVariableData function not supported?