The code below returns an error saying operation is invalid for a Memo, Blob...

It looks like I can't use cast('' as M) in a SQL select on more than one part of a UNION. If I remove the code after the union it works. As an easy fix I can remove the CAST() and do an alter table afterwards to add the memo.
Any comments?

TEXT TO mSqlCommand noshow pretext 15 TEXTMERGE
  select
  prempl.lname,
  prempl.fname,
  prempl.emplid,
  jsusers.user,
  cast(0 as  N(1,0) ) as updtflag,
  cast('' as M) as fmemo
  from <<xfjsusers>>
  join <<xfprempl>> on prempl.k_prempl = jsusers.k_prempl
  where jsusers.dbname == '<<mdbname>>'

  UNION
  select
  jsusers.lname,
  jsusers.fname,
  jsusers.emplid,
  jsusers.user,
  cast(0 as N(1,0) ) as updtflag,
  cast('' as M) as fmemo
  from <<xfjsusers>>
  where jsusers.dbname == '<<mdbname>>'
  and jsusers.k_prempl = 0

  into cursor c_jsusers readwrite
ENDTEXT
&mSqlCommand