[xsl] NaN

["Sathasivam, Elayaraja" <elayaraja.sathasivam@xxxxxxxxxxxxx>]

XSLT: Version 1.0
Platform: Windows XP

XML:
<Charge Id="77" Amount="139.97" CurrCode="EUR" Type="5" PT="P"/>
<SAPCreditItem CreditDate="20080520" CreditAmount=""/>

XSL:
<xsl:variable name="total" select="Charge[@Id='77' and @Type='5'
and  @PT='P']/@Amount + SAPCreditItem/@CreditAmount"/>

Result: <xsl:value-of select="$total"/>

I tried with, <xsl:variable name="total" select="Charge[@Id='77' and @Type='5'
and  @PT='P']/@Amount[number()=number()] +
SAPCreditItem/@CreditAmount[number()=number()]"/>...But again the output is
Nan.

How to avoid NaN. When the value is empty( CreditAmount="" ) as shown above.


Expected result: 139.97
Actual result: NaN



Regards,
Raja







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