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Appendix
117
When the pump goes offline while in use, the PCC creates a record of "Off -Progress data"
meaning the pump went offline and the transaction data in this record is from monitoring progress
sale data and may be less than the actual amount dispensed.
When the dispenser comes back online, the PCC attempts to recover the actual amount which
may or may not be available depending on the age of the dispenser, ie whether it has non volatile
memory for the transaction. If it can get the data it creates a 2nd record of "Off - Retrieve sale"
with the actual amount but does not store this against the PAN as we cannot guarantee that the
two amounts are for the same transaction.
Commercially the customer is supposed to be charged the progress sale data amount so he gets
the benefit of any discrepancy. The second record is for information purposes only.
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