dblink error when calling a function that returns setof..

I have this function that works great if call from the db your connected to
CREATE TYPE v_over_c AS (linkid INTEGER,from_sec INTEGER,to_sec INTEGER,volume INTEGER,v_over_c numeric);

CREATE OR REPLACE FUNCTION compute_v_over_c(aggregation INTEGER,start_time INTEGER,end_time INTEGER)

returns setof v_over_c AS
$$
DECLARE
r v_over_c%ROWTYPE;

i INTEGER:=$2;

BEGIN

LOOP
EXIT WHEN i=$3;
FOR r IN SELECT a.linkid,i AS from_sec,i+$1 AS to_sec,b.flow-a.flow ,ROUND(CAST((b.flow-a.flow)/(capacity*lanes*$1/3600) AS numeric),2) AS v_over_c FROM links_flow_out(i) a,links_flow_out(i+$1) b, linkdetails c
WHERE c.id=a.linkid AND b.linkid=a.linkid LOOP
RETURN next r;
END LOOP;
i:=i+$1;
END LOOP;
RETURN;
END;
$$
language plpgsql;
when I call this function like:
SELECT * FROM compute_v_over_c (300,1800,3600); it returns a set of v_over_c just fine
but when I call it from a remote db so I can join simular results like this:
SELECT * dblink('mylink', 'SELECT * FROM compute_v_over_c (300,1800,3600)'); mylink being a connection to another db
I get this
ERROR: function returning record called in context that cannot accept type record
any ideas?