national characters in plpgsql

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There is a problem with this function:
create function fn_ZakadyLudzie_XXXS() returns
opaque as '
--
-- REFERENTIAL INTEGRITY CHECKING CODE BETWEEN
Zakady AND Ludzie
-- ENSURES THAT INTEGRITY IS MAINTAINED AFTER AN
UPDATE ON TABLE Ludzie (Slave)
-- Generated by PgUpT 99-11-04
--
DECLARE
l_m Zakady%ROWTYPE;
l_err_text text;
l_Flag integer;
BEGIN
l_Flag := 0;
if new.IDZakadu IS NOT NULL then
l_Flag := 1;
end if;
if l_Flag > 0 then
SELECT * FROM Zakady INTO l_m
WHERE
IDZakadu = new.IDZakadu
;
if not found then
l_err_text := f_Exception(3201,
''Zakady,Ludzie'');
raise exception ''%'', l_err_text;
end if;
return NULL;
else
return new;
end if;
END;'
language 'plpgsql';
When I try to insert a row in table Ludzie, I've
got a message:
NOTICE: plpgsql: ERROR during compile of
fn_zakadyludzie_xxxs near line 7
ERROR: parse error at or near "Zak"

I suppose there is a problem with characters like
"", but I don't know why. Altough there are many
characters like this one in the database (eg.
names of rows, columns or indexes they don't make
any errors.

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