ew. numer identyfikacyjny połączenia

Można mniej dosłownie: numer referencyjny/identyfikacyjny sesji (przelewów/przelewowej)

If you make a payment or transfer using online or telephone banking a unique CALL REF.NO.XXXX is assigned to all the transactions made during that session.
When an online or telephone banking transaction is initially debited from your account the call reference number will show as the transaction description on your statement. Once our systems complete processing of the transaction a full description will be displayed on your statement as well as the call reference number. The full description for these transactions is normally available by the next working day.
You may notice some call ref numbers showing as 0000, the CALL REF.NO.0000 is a Transfer/Payment made using our mobile banking app.
http://www.rbsinternational.com/corporate/corporate-update.a...