non-functional update notice unneccesarily

Brett McCormickS <brett@abraxas.scene.com>

From: Brett McCormickS <brett@abraxas.scene.com>
To: pgsql-hackers@hub.org
Date: 1998-05-06T06:08:32Z
Lists: pgsql-hackers
update mempayment set paywho = 'icvproxy' from do_addpayment where dappays
eq = payseqid;
NOTICE:  Non-functional update, only first update is performed
UPDATE 31

more than one update was indeed performed..
I beleive this has happened to me before..