o  When you delete a record, local fields within that record are
       marked for deletion at the end of the transaction, provided
       that they remain unused at the end of the transaction. Using
       CDO, there is no way to reuse those local fields. But, it is
       possible to use them through the Oracle CDD/Repository APIs.
       Therefore, the local fields cannot be automatically deleted at
       the same point in the transaction as the record.

       You must either delete the record and field in separate
       transactions (outside the START_TRANSACTION . . . COMMIT stream
       of commands) or, to accomplish this in one transaction, use
       the ENTER command to enter the local field, delete the record,
       delete the local field, and then delete the global field.

    o  Usually, if Oracle CDD/Repository issues any errors between
       the START_TRANSACTION and COMMIT commands, it forces you
       to roll back the transaction. In some cases, such as in the
       CHANGE or DELETE commands, Oracle CDD/Repository allows you to
       commit the transaction. The general rules are:

       -  If you receive an Oracle CDD/Repository error of E or F
          severity, such as a CDD-E-NODNOTFND message, you must abort
          the transaction.

       -  If you receive a CDO error of E or F severity, such as a
          CDO-E-NOTFOUND message, you can continue to operate in the
          current transaction.