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Impact of technical problems in processing debit card transactions resolved

Due to a technical problem in processing Swiss and Liechtenstein debit card transactions, a number of debit card transactions were booked twice in the night of Wednesday 22 to Thursday, 23 January 2014. Working closely with the banks, SIX immediately developed and implemented a solution to rebook the relevant amounts. At present, the vast majority of these double bookings have been reversed (99.93%), meaning that no clients incurred any losses. The remaining double bookings are in progress and will be reversed individually in the coming days. SIX greatly regrets this incident. 
On average, SIX processes around 1.4 million transactions involving Swiss and Liechtenstein debit cards each day. The daily processing of the transactions takes place each night for the past day. In the night of Wednesday 22 January to Thursday 23 January, the transactions from Wednesday were correctly booked. Due to a technical problem, however, the transactions from Tuesday 21 January were booked for a second time. However, no payments were executed twice, meaning that there were no duplicate cash flows. 
As at 28 January 2014, the vast majority of the banks concerned had been able to reverse the bookings (99.93%) of all double bookings were corrected in this way. The banks are currently working on the remaining double bookings. These double bookings will also be corrected in the next few days. Cardholders/Bank clients did not incur any losses; the transactions that were booked twice were automatically reversed. Data security was maintained at all times. 
SIX greatly regrets the incident on 23 January and would like to apologize to the banks and banking customers for the inconvenience caused.