unload to file in a stored proc not allowed ?

Hi, an unload command that works fine using dbaccess interactively wont work within a stored procedure. When I try to create the stored procedure it generates a syntax error, pointing at the first char of the unload statement. Is it the case that some SQL statements are not allowed within stored procedures ? I checked the UNLOAD TO documentation but could find nothing about this. -Peter Groarke BTW, here is the stored proc: create procedure sac() unload to '/tmp/sac' delimiter '!' select * from blah; end procedure; ( informix 7.23.UC7 for solaris 2.6)