[GENERAL] Why pgsql function is working on vers 8.0/windows and not on ver 7.3.2/rad hat?

[in-consulting.net]

Hy, I'm using a type defined by me: output_mt, on the function CREATE OR REPLACE FUNCTION happy()   RETURNS SETOF output_mt AS.... and when I want to initialize from another function: CREATE OR REPLACE FUNCTION msg()   RETURNS output_mt AS.... as: output_mt=msg(); it gaves me: WARNING:  plpgsql: ERROR during compile of happy near line xx ERROR:  parse error at or near "output_mt". Why is this working on version 8.0 with windows and not on version 7.3.2 on linux, how can I solve this problem, do I need a cast or something ? Thanks, Otto.