-534 THE PRIMARY KEY CANNOT BE UPDATED BECAUSE OF MULTIPLE-ROW UPDATE

Explanation
  An UPDATE operation attempted to update a primary
key on multiple rows of the object table.
  An UPDATE statement
updating the primary key cannot be used to update more than one row
of the object table.
 Note: This SQLCODE will only be issued for
plans and packages bound prior to Version 5. SQLCODE -534 will not
be issued for dynamic SQL or plans and packages bound with Version
5 or later releases.

System action
  The UPDATE statement cannot be executed. The
contents of the object table are unchanged.

Programmer response
  Examine the search condition of the UPDATE
statement to make sure that no more than one row of the object table
is selected to be updated.

SQLSTATE
  21502 