select="key('professionlevelkey','$referid')">
You have used the string '$referid' as the key value. You probably have
no key with that value. If you want the value of the variable referid
then you want $referid not '$referid'. Although if that is the only
place you use that variable, which seems likely then you don't need a
variable at all, you could just use @levelref
David
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