XSLT question

Hi Guys,

today i am working on XSLT IDoc mapping and i need to convert a number.

This one works fine;

<xsl:value-of select='format-number(BRGEW, "#.00")'/>

but it cannot be used in following form.

<xsl:value-of select='format-number(E1EDL12[ATNAM='A002']/ATWRT, "#.00")'/>

Has anyone solution or suggestion?

Thanks in advance,

PM