On 12 December 2013, the European Central Bank (ECB) recast guideline of 26 September 2013 on a trans-European automated real-time gross settlement express transfer system (TARGET2) was published in the Official Journal of the European Union (OJ). The guideline was originally published in April 2007 and following amendments has been recast to improve clarity and transparency. TARGET2 is the Eurosystem's real-time gross settlement (RTGS) system for the euro. It has a decentralised structure linking together national RTGS systems and the ECB Payment Mechanism.