What is the fine-grained topic of the following text: The new hikes come after the CBUAE started to enforce the new Eibor system effective mid-April, under which the Bank stopped acting as the calculating agent of Eibor, assigning this role to Thomson Reuters Ltd , a new move confirmed by the bank as going in conformity with best international practices in terms of transparency. Only return the topic.
Implementation of new Eibor system by CBUAE and role assignment to Thomson Reuters Ltd