These were introduced by the 2003 reform of the Common Agricultural Policy to implement the single payment scheme. Payment entitlements were distributed to farmers based on historical data (at regional or individual farmer level). From the 2003 reform, to qualify for a single payment, each farmer had to activate the payment entitlements that he or she held together with the same number of eligible agricultural hectares. The reform for the period after 2013 foresees that these payment entitlements will expire and be replaced by newly-established payment entitlements under the basic payment scheme. By derogation, some member states respecting certain conditions may keep existing payment entitlements.