saxon fail to find xslt functions

I have this function in an xsl doc - I don't think i can use 
template match because it needs to run on all dates, to convert
CCYY-MM-DD dates into YYMMDD, and there are a lot of date nodes
in the xml document with various names.

<saxon:function name="bcp:fixDate">
    <saxon:return
select="concat(substring(.,3,2),substring(.,6,2),substring(.,9,2))"/>
</saxon:function>

i'm calling it like this:
<xsl:value-of select="bcp:fixDate(bas:InvoiceDate)"/>

the xsl, bcp, saxon and bas namespaces are defined in the
<xsl:stylesheet>
element and if I don't call the function, transformation works ok.
If I do call the function, i get this error from saxon:

The URI http://www.bcpsoftware.com/schema does not identify an
	external Java class

Of course it doesnt, it's the namespace identified by the bcp: prefix
I'm attaching to the function. According to my saxon documentation
	"In a function call where the function name has a non-null 
	namespace URI,the system searches first for a matching 
	saxon:function definition, then for an external Java function"
So why is it looking for an external Java class when there is a
matching saxon:function definition?

I'm not using EXSLT func: namespace because I don't think 
InstantSaxon 6.2.2 supports it.

______________________________________________________________________
Dominic Blythe
Programmer
BCP Ltd

BCP House, 151 Charles St, Stockport, SK1 3JY  UK
t: 0161 355 3000 f: 0161 355 3001
e: dominic.blythe@xxxxxxxxxxxxxxx
_____________________________________________________________________
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