xsl:key may not contain references to variables

Hi,

  I thought this should have been a popular question,
but somehow I did not find it in the archive.
  I am in the process of upgrading from Saxon 6.0.2 to
the latest 6.5.2.  While doing regression testing, I
found compile errors "xsl:key may not contain
references to variables".  Guess the newer version is
more tightly following the specs.
  I can expand the variables so that it no longer use
variables in both match and use attributes, but it
will make the code less-readable and more difficult to
maintain.  Anyone had similar problem and had a more
elegant solution?
  Attached are some of the examples of the variables
and xsl:key currently in my code.

Thanks,
Xiaocun

<!-- Find all lineitems, key on
string(LineItemLotName) to handle 0 or 1
LineItemLotName -->
<xsl:variable name="LineItemLotColumn"
select="$LineItemHeader/cell[.=saxon:n2v($mapRFQ,'LineItemLotName')]/@column"/>
<xsl:key name="lineitemLotsKey" match="//row[(_at_)row &gt;
$LineItemHeaderRow and @row &lt; $BidHeaderRow]"
use="string(cell[(_at_)column=$LineItemLotColumn])"/>


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