SRF problem

Hi All,
I'd like to write an SRF but I'm block a strange error message

WARNING: plpgsql: ERROR during compile of check_close2 near line 11
ERROR: return type mismatch in function returning tuple at or near ";"

I get this message even if the return rowset contains 0 or more tuples. What
is done wrong?
The code:
-----------------------------------------------------------------
create type CHECK_CLOSE as (
prooftype text,
id int,
sn text,
partnername text,
performancedate text,
detailcount int
);
------------------------------------------------------------------
create or replace function check_close2() returns CHECK_CLOSE AS '
declare
R CHECK_CLOSE%ROWTYPE;
begin
R.prooftype := ''INCINV'';
R.id := 1;
R.sn := ''012334'';
R.partnername := ''someone'';
R.performancedate := ''2004.02.01'';
R.detailcount := 0;
return next R;
return;
end;'
language 'plpgsql';
------------------------------------------------------------------
select * from check_close2();
WARNING: plpgsql: ERROR during compile of check_close2 near line 11
ERROR: return type mismatch in function returning tuple at or near ";"

Thank you very much.
-- Csaba Együd