BUG #2139: Problem when calling functions without any argument

The following bug has been logged online:

Bug reference:      2139
Logged by:          Jacques Gollion
Email address:      jgollion@sambatechnologies.com
PostgreSQL version: 8.1.1
Operating system:   Windows 2000
Description:        Problem when calling functions without any argument
Details:

have have written some functions without any argument. When my powerbuilder
V9 application calls these functions, the behaviour is different :

*Using ODBC driver, it works well
*Using JDBC driver (I tried several versions), I get the error message
"ERROR : Syntax error at or near $1. If I add a unused argument to the
function; it works.
If I call in JDBC the same function for Oracle or Sybase, it works.
If I call other PostGreSQL functions with arguments, it works.

Where am I wrong ?

Thanks in advance for your help.