Format number function for displaying ###'###.00 format

Hi All,

I have a requirement to display the number field in ###'###.00 format in a report. I don't want to touch base rdf for that and I am trying to modify the template fields using this-

I have defined it in starting of the report

<xsl:decimal-format xdofo:ctx="begin" name="GBP" decimal-separator="." grouping-separator=" ' "/>

and format number on the field but it shows error

<?format-number(C_AMOUNT_POL,'###'' ###.00','GBP')?>  

Could you please gyide me how to place the ' value in format number definition.

Thanks,