problem with unc relative path

Win XP sp2 - XSLT 2.0 - FOP trunk using Saxon 8.7.?

I'm having some difficulty resolving the relative file path for a document
in my transformation when I run from a unc file path.

The problem happens when I run the program from an unmapped folder on a
remote server, i.e. "\\lvsserver0\lvsapps". The program, and the document I
am trying to load are both in the same folder, but it seems unable to
resolve the relative file path.

When I run the same program + file combination from a local drive, or from
the same server's mapped drive, i.e. "z:\lvsapps", no problem, the document
loads properly.

How do I get this to resolve properly on an unmapped drive?

See below for details.

Thanks for any suggestions,

Rick

_______________________________________________

Xml fragment:
	 <letter-file>Cor_CreditLetter.xml</letter-file>


XSL fragment

	<xsl:if test="empty( doc-available( letter-file ) )">
  	<xsl:message select="concat( '==== Unable to locate the credit
letter file: ', letter-file, ' . See your administrator to resolve.' )"
terminate="yes" /> 
  	</xsl:if>
 	<xsl:for-each select="doc(letter-file)">
 	 <xsl:apply-templates /> 
  	</xsl:for-each>

Error:

SEVERE: Exception
net.sf.saxon.trans.DynamicError: Failed to load document
Cor_CreditLetter.xml
	at
org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:167)
	at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:114)
	at org.apache.fop.cli.Main.startFOP(Main.java:159)
	at org.apache.fop.cli.Main.main(Main.java:190)

---------

; SystemID: file:////Lvsserver0/lvsapps/Cor_CreditLetter.xsl; Line#: 195;
Column#: -1
net.sf.saxon.trans.DynamicError: Failed to load document
Cor_CreditLetter.xml
	at
net.sf.saxon.expr.ComputedExpression.dynamicError(ComputedExpression.java:62
5)