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N_XTRANCAN()
Cancel (rollback) transaction

Syntax
N_XTRANCAN()

Returns
True if successful.

Remarks
Directs the server to rollback all pending updates for the current 
transaction.   A pending update is any  update made since the most recent 
N_XTRANON().

This is an inelegant and ungraceful way to back out of a transaction. Use it 
only in an emergency.

A better method is to lock all records you plan to update before updating 
any of them.  This will ensure that the transaction will complete 
successfully.

Example
* Start transaction
N_XTRANON()
IF <transaction completed ok>
  * End transaction
  N_XTRANOFF()
ELSE
  * Roll back transaction
  N_XTRANCAN()
ENDIF