Commission Implementing Regulation (EU) 2020/501 of 6 April 2020 derogating from Implementing Regulation (EU) No 809/2014 as regards the final date of submission of the single application, aid applications or payment claims, the final date for notification of amendments to the single application or payment claim and the final date for applications for allocation of payment entitlements or the increase of the value of payment entitlements under the basic payment scheme for the year 2020