storage area <str> not readied in update usage mode

  Explanation:  You attempted to modify the contents  of  an  area
  without having declared your intentions.

  User Action:  If you have not readied  the  area  yet,  you  can
  READY  for  UPDATE.   If  you  have already readied it, you must
  abort your transaction by executing a ROLLBACK  before  you  can
  READY for UPDATE.