PROBLEM WITH FUNCTION

HI list,
i have a next function

CREATE OR REPLACE FUNCTION "public"."contador_distrito_activos" (numeric,
numeric, numeric) RETURNS SETOF "public"."ty_activo" AS'
declare
con bigint;
act bigint;
emp alias for $1;
sed alias for $2;
zon alias for $3;
begin
con := contador_distrito(1,2,5);
if (con > 0) then
act := ( select count(*) from activos where
activos.co_empresa = 1 and
activos.co_filial = 2 and
activos.co_zona = 5);
if act isnull then
act := 0;
end if;
else
con :=0;
act :=0;
end if;
return con , act;

end;
'LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

But this function only return the value of con ;

any idea

Thank