EBU Single Rulebook Q&A 10 June 2016 2016_2784 Outflows from operational deposits

What is the difference between deposits arising from clearing accounts of financial institutions and deposits arising from correspondent banking? According to Article 27(5) of the Delegated Act "Deposits arising out of a correspondent banking relationship... shall not be treated as operational deposit and shall receive a 100 % outflow rate."However, clearing deposits are treated with 25%.