How to put error message to out file in XSLT - xslt

Question

I am looking for a way to generate additional file with error message in case of processing failure.
For example replacement for function concat:
<xsl:function name="my:concat">
<xsl:param name="value1" as="node()*"/>
<xsl:param name="value2" as="node()*"/>
<xsl:try>
<xsl:value-of select="concat($value1,$value2)"/>
<xsl:catch>
<xsl:value-of select="concat($value1[1],$value2[1])"/>
<xsl:variable name="LOCALNAME_ERROR" as="xs:string" select="'error.xml'"/>
<xsl:result-document href="{$LOCALNAME_ERROR}" method="xml" encoding="UTF-8" indent="yes" omit-xml-declaration="no">
<ERROR>
<DOCID>
<xsl:value-of select="'DOCID'"/>
</DOCID>
<ERRORCODE>
<xsl:value-of select="$err:code"/>
</ERRORCODE>
<ERRORDESCRIPTION>
<xsl:value-of select="$err:description"/>
</ERRORDESCRIPTION>
<FIELDNAME>
<xsl:value-of select="if (count($value1) > 1) then name($value1[1]) else name($value2[1])"/>
</FIELDNAME>
<FIELDPATH>
<xsl:value-of select="if (count($value1) > 1) then path($value1[1]) else path($value2[1])"/>
</FIELDPATH>
<FIELDVALUE>
<xsl:value-of select="if (count($value1) > 1) then $value1 else $value2"/>
</FIELDVALUE>
</ERROR>
</xsl:result-document>
</xsl:catch>
</xsl:try>
</xsl:function>
So in case of two occurrences it will produce a nice error message with info where error happened.
Test file:
<?xml version='1.0' encoding='ISO-8859-1'?>
<DUMMY_001>
<field1>value_1</field1>
<field2>value_abc</field2>
<field2>value_xyz</field2>
<field3>value_3</field3>
<field4>value_4</field4>
</DUMMY_001>
Outcome:
<ERROR>
<DOCID/>
<ERRORCODE>err:XPTY0004</ERRORCODE>
<ERRORDESCRIPTION>A sequence of more than one item is not allowed as the first argument of concat()</ERRORDESCRIPTION>
<FIELDNAME>field2</FIELDNAME>
<FIELDPATH>/Q{}DUMMY_001[1]/Q{}field2[1]</FIELDPATH>
<FIELDVALUE>value_abc value_xyz</FIELDVALUE>
</ERROR>
In saxon 9.9.1.7 the error is: XTDE1480 Cannot execute xsl:result-document while evaluating xsl:function, but in saxon 9.6.0.7 it works.
Could you advise if there is a reliable way to create such error messages in the latest saxon versions?