Hi all,I want to build a view rely on this SQL statement.I can create it without problems but when I execute it, shows me an error.(#incompatibility operator error).--

SELECT a.date, a.concept, SUM(a.amount) AS n_impo, a.quotas ;
  FROM Master a ; 
  WHERE BETWEEN(a.fecha,?tdDateFrom,?tdDateTo) ;
  OR a.plan = .T. ;  
  AND a.date <= tdDateFrom ;
  AND a.date <= tdDateTo ;  
  AND a.quotas <> "0" ;
  ORDER BY a.date ;
  GROUP BY a.nro_oper ;
  INTO CURSOR c_names

** tdDateFrom and tdDateTo are date parameters that I had defined into the view.
What's wrong in the structure ? First ask me to input date´s statements and then the error occurs.------------
TIA