XML to XML , unable to use copy of select with Repeated element - xslt-2.0

Question

We need to perform XML to XML transformation, in expected output we need to have exact same input XML , but will need store WE value in variable , so that we can apply EDM and replace the value in the same place.
Please guide on the same.
XSLT:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fn="http://www.w3.org/2005/xpath-functions" exclude-result-
prefixes="#all" >
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />
<xsl:template match="/">
<xsl:copy-of select="bap/tables/table"/>
</xsl:template>
</xsl:stylesheet>
INPUT -
<?xml version="1.0" encoding="UTF-8"?>
<bap name="ABC">
<tables>
<table name="IT">
<row id="0">
<field name="FIL">2019</field>
<field name="WE">000A</field>
<field name="CON" />
</row>
<row id="1">
<field name="FIL">2019</field>
<field name="WE">000B</field>
<field name="CONTROL" />
</row>
<row id="2">
<field name="FIL">2019</field>
<field name="WE">000C</field>
<field name="CON" />
</row>
</table>
</tables>
</bap>
OUTPUT:
<?xml version="1.0" encoding="UTF-8"?>
<bap name="ABC">
<tables>
<table name="IT">
<row id="0">
<field name="FIL">2019</field>
<field name="WE">0987</field> - value should be replaceable
<field name="CON" />
</row>
<row id="1">
<field name="FIL">2019</field>
<field name="WE">98I8</field>
<field name="CONTROL" />
</row>
<row id="2">
<field name="FIL">2019</field>
<field name="WE">76y5</field>
<field name="CON" />
</row>
</table>
</tables>