If you have the following simple condition test
<xsl:param name="billingRepeat" />
<xsl:choose>
<xsl:when test="not($billingRepeat)">
<xsl:apply-templates select="Document" />
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="Document" mode="Empty"/>
</xsl:otherwise>
</xsl:choose>
and the parameter billingRepeat is defined as Boolean in Context Store and value is passed as DataConstant reference to false,
the condition test is wrongly evaluated as false (not(false)) should be true. We tried with @washi several modifications of the condition and the only working way was to modify it like this <xsl:when test="$billingRepeat='false'">
If you modify the condition like this <xsl:when test="$billingRepeat"> and no matter if $billingRepeat takes value true or false, it is evaluated always as true.