These complexities might give rise to operational concerns and therefore need to be properly addressed right from the start as only the most stringent implementation and enforcement can restore confidence in the banking system and the institutional framework. Another point of criticism is that banking union only covers deposit-taking institutions.
For the 6 Greek banks that participated using only the standardized  2  BIS Review 42/2005  approach at that time, there was a 7.5% net increase in the combined capital requirement for credit and operating risk compared to the corresponding requirement under the existing framework (a 2.5% decrease of the requirement for credit risk and a 10% increase for operating risk).