UEFA are banging City for the period 2012-2016, the original reporting period was 2011-2014.
City signed a settlement agreement which dealt with matters up to 2014, but additionally imposed a special UEFA reporting regime with specified targets for the 2014/5 and 2015/6. UEFA then signed us off as having complied with the reporting regime up to the end of 2015/6. Thus, whatever breaches we're accused of, if they come at any point between 2012 and 2016, they involve UEFA reopening reporting periods already expressly closed off.