BUG #6328: Wrong error message for insert-sql

The following bug has been logged on the website:

Bug reference: 6328
Logged by: Rigoletto Eikenberg
Email address: eikenberg(at)golze(dot)de
PostgreSQL version: 9.0.0
Operating system: windows server 2008 R2
Description:

The sql
INSERT INTO auftragpos (orderno,position,item) VALUES
('testorder18',1,00123);
works fine,

but
INSERT INTO auftragpos (orderno,position,item) VALUES
(testorder18,1,00123);
brings error:
FEHLER: Spalte »testorder18« existiert nicht (Column »testorder18« not
exists)
LINE 1: ...T INTO auftragpos (orderno,position,item) VALUES (testorder1...

But »testorder18« is a value, not a column-name!?!?
If there is a problem it should bring a message that the value for column
"orderno" has the wrong format.

Regards
Rigoletto