Using xslt, I need include the namespace prefix to both the root nodes of XML

Expected output:

<ns0:ASN xmlns:ns0="USA_Common_856_Outbound">
  <SITE_CODE>RGU</SITE_CODE>
  
 <Line Items xmlns:ns0="USA_Common_856_Outbound">
        <item code>10141498</item code>
  </Line Items>
</ns0:ASN>



    <?xml version="1.0" encoding="UTF-16"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
                

 

 xmlns:msxsl="urn:schemas-microsoft-com:xslt"
          
      xmlns:var="http://schemas.microsoft.com/BizTalk/2003/var"
                    
      exclude-result-prefixes="msxsl var s0 userCSharp" version="1.0" 
      xmlns:s0="http://schemas.royalcanin.com/BizTalk/2012" 
      xmlns:ns0="USA_Common_856_Outbound" 
                    
      xmlns:userCSharp="http://schemas.microsoft.com/BizTalk/2003/userCSharp">
      <xsl:output omit-xml-declaration="yes" indent="yes" method="xml" version="1.0" />
      <xsl:template match="/*">
        <xsl:element name="ns0:{local-name()}" namespace="{namespace-uri()}">
          <xsl:apply-templates select="@*|node()" />
        </xsl:element>
      </xsl:template>
    
        <ns0:ASN>
          <SITE_CODE>
            <xsl:text>RGU</xsl:text>
          </SITE_CODE>
     <Line Items xmlns:ns0="USA_Common_856_Outbound">
       <item code>
                     <xsl:value of select="../../s0:No/text()" />
                   </item code>
    
    </Line Items>
    </ns0:ASN>

ns0 needs to be applied for both <ASN> and <Line Items>. Either <Line Items> is empty without namespace else ns0 is missed. only for <ASN> ns0 is applied.

I tried many samples but it is not working.