22nd July 2015
(EU) No 575/2013 Article 285, paragraph 4
"If an institution has been in involved in more than two margin call disputes on a particular netting set over the immediately preceding two quarters that have lasted longer than the applicable margin period of risk under paragraphs 2 and 3, the institution shall use a margin period of risk that is at least double the period specified in paragraphs 2 and 3 for that netting set for the subsequent two quarters."
22nd July 2009
On balance I prefer then.