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 ROLLBACK [ALL | savepoint%]
 
 Usage Notes
   ■ Use SAVEPOINT to designate a savepoint, which marks the beginning of a
     subset of operations that can be rescinded. See: ◄SAVEPOINT Function►
 
   ■ If you specify a savepoint% argument, ROLLBACK returns the data
     affected by the transaction to its state at that savepoint.
 
   ■ If you do not specify a savepoint% argument, ROLLBACK returns the data
     affected by the transaction to its state at the previous savepoint, or
     at the beginning of the transaction if there are no intermediate
     savepoints.
 
   ■ ROLLBACK ALL rescinds all ISAM operations in a transaction and returns
     the data to its initial state at the beginning of the transaction.
 
   ■ Use BEGINTRANS to indicate the beginning of a transaction.
     See: ◄BEGINTRANS Statement►
 
   ■ Use COMMITTRANS to commit all operations since the most recent
     BEGINTRANS. See: ◄COMMITTRANS Statement►