You should take in account re_date also.

SELECT Cl_Ref, re_date, MIN(R.Re_Time) ;
  FROM Referral R;
 WHERE BETWEEN(DTOS(R.Re_Date), "20010101", "20010201");
 GROUP BY Cl_Ref, Re_Date
  INTO CURSOR Minimums NOFILTER

SELECT *;
  FROM Referral;
 WHERE BETWEEN(DTOS(Re_Date), "20010101", "20010201");
   AND DTOS(re_date) + Re_Time = (SELECT DTOS(re_date) + min_re_time ;
   		    FROM Minimums;
   		   WHERE Minimums.Cl_Ref = Referral.Cl_Ref) ORDER BY Cl_Ref

>Here is the only other way (with minimum) effor that I can think to do it:
>
>

SELECT Cl_Ref, MIN(R.Re_Time) ;
>  FROM Referral R;
> WHERE BETWEEN(DTOS(R.Re_Date), "20010101", "20010201");
> GROUP BY Cl_Ref, Re_Date
>  INTO CURSOR Minimums NOFILTER
>
>SELECT *;
>  FROM Referral;
> WHERE BETWEEN(DTOS(Re_Date), "20010101", "20010201");
>   AND Re_Time = (SELECT min_re_time ;
>   		    FROM Minimums;
>   		   WHERE Minimums.Cl_Ref = Referral.Cl_Ref) ORDER BY Cl_Ref
>
>

>
>If anyone can think of another way, please let me know.
>
>Thanks
>Kev