When the ENTER XXX AMOUNT entry screen appears ( XXX is the tax type, e.g. GST):
1. Key 
 in the Tax amount, and press the 
  key, 
 or simply press the
 
  key, 
 or simply press the 
  key to 
 leave this blank.
 
  key to 
 leave this blank.
The ENTER CUSTOMER REFERENCE NUMBER entry screen appears.
2. Key in the Customer Reference number, and press the 
  key, 
 or simply press the
  key, 
 or simply press the 
  key 
 to leave this blank.
  key 
 to leave this blank.
The terminal communicates with the Moneris Host.
Go back to the transaction.