The Office of the Data Protection Commissioner has decided not to investigate further a recent error by AIB which led it to send 15,000 notifications to its customers containing the private bank account details of other individuals.
However, it said it would do so if it receives any formal complaints from AIB customers about the matter. It had not received any such complaints by Friday afternoon.
Diarmuid Hallinan, who is an assistant data protection commissioner, confirmed that the office has now received a full report on the error from the bank.
A total of 11,000 AIB customers were affected by the mistake, which is believed to have occurred as a result of a computer glitch relating to the bank's issuing of international payment advice notices.
"We do not propose to take further action except in response to a formal complaint from an AIB customer," Mr Hallinan said.
A spokesman for AIB declined to outline what issues its report to the Data Commissioner had identified, or to outline what measures had been introduce to prevent the problem recurring.
"We have kept the Office of the Data Commissioner fully informed, and have provided a full report to him," he said.
"We have also contacted each of the customers involved to explain the error, to apologise and to reassure them that all possible steps are being taken to ensure it will not happen again."
Customers of the bank who either received or transferred an international payment between November 13th and 15th were affected by the error.
Those who received the notices were wrongly provided with details relating to someone else's transaction. As a result, they were incorrectly told the transaction related to their account.
The bank stressed at the time that no customer accounts had been incorrectly credited or debited as a result of the error.
However, the Office of the Data Protection Commissioner had labelled it a "serious breach".
It is understood that as many as 7,500 of the notices contained the names, addresses and full bank account numbers of AIB customers.
This meant these details, contained in notices relating to "inward" payments, were provided to other customers of the bank.
Most of the remaining "outward" payment notices included the name of a bank account holder, usually with a bank other than AIB, and their account numbers, but not their address.
One of the incorrect notices, seen by The Irish Times, wrongly informed the customer that a payment of €5,000 had been made from their business account to an account with the Bank of China.
Following the disclosure of the problem at AIB, it emerged that internal errors at two other major Irish financial institutions - Quinn-direct insurance and Bank of Ireland - had also led them to send incorrect personal information to their customers.