ORA-30926: UNABLE TO GET A STABLE SET OF ROWS IN THE SOURCE TABLES

create table CAL_OBJ
(
  obj_name    VARCHAR2(100) not null,
  obj_type    VARCHAR2(50),
  obj_title   VARCHAR2(50),
  description VARCHAR2(500),
  sub_system  VARCHAR2(100),
  status      VARCHAR2(20)
);


create table OBJTEST
(
  obj_name    VARCHAR2(100),
  obj_type    VARCHAR2(50),
  obj_title   VARCHAR2(50),
  description VARCHAR2(500),
  sub_system  VARCHAR2(100),
  status      VARCHAR2(20)
);

merge into cal_obj e1
      using objtest e2
      on (e1.obj_name = e2.obj_name)
when matched then update set e1.description    = e2.description,
                             e1.sub_system     = e2.sub_system
        when not matched then insert
         values (e2.obj_name, e2.obj_type, null, e2.description,e2.sub_system,null);

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