I am trying to create a union but I keep getting the message that the thing is union compatable. The two tables have an identical field structure layout:
Any help appricated.

SELECT Meetings.begintime, Meetings.pname, ;
  Meetings.p2name,  Meetings.p3name, Meetings.surgeon,;
  Meetings.plname, Meetings.pfname,;
  Meetings.comments, Meetings.meetingnumber, Meetings.patientphone,;
  Meetings.dob;
 FROM  sched!meetings ; 
 WHERE Meetings.date BETWEEN ?gd_startd AND ?gd_Endd;
   AND Meetings.dept = ?gcDept ;
UNION ALL ;
SELECT BLOCKS.begintime, BLOCKS.pname, ;
  BLOCKS.p2name , BLOCKS.p3name , BLOCKS.surgeon,;
  BLOCKS.plname,BLOCKS.pfname,;
  BLOCKS.comments, BLOCKS.meetingnumber, BLOCKS.patientphone,;
  BLOCKS.dob;
 FROM  sched!BLOCKS ;
 WHERE BLOCKS.date BETWEEN ?gd_startd AND ?gd_Endd;
   AND BLOCKS.dept = ?gcDept