JOIN syntax

Looking at SQL92, it seems that I ought to be able to do this:

SELECT * FROM invoice INNER JOIN (SELECT * FROM invoice_line WHERE lineno > 1)
ON invoice.invno = invoice_line.invno;
ERROR: parser: parse error at or near "("

(I know it can be successfully expressed in a more complex WHERE clause).

Is there anything wrong with the syntax, or is it a missing feature?

--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
PGP: 1024R/32B8FAA1: 97 EA 1D 47 72 3F 28 47 6B 7E 39 CC 56 E4 C1 47
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C
========================================
"Honour thy father and mother; which is the first
commandment with promise; That it may be well with
thee, and thou mayest live long on the earth."
Ephesians 6:2,3