Case C-93/10: Judgment of the Court (Third Chamber) of 27 October 2011 (reference for a preliminary ruling from the Bundesfinanzhof — Germany) — Finanzamt Essen-NordOst v GFKL Financial Services AG (Sixth VAT Directive — Articles 2(1) and 4 — Scope — Concepts of ‘supply of services effected for consideration’ and ‘economic activity’ — Sale of defaulted debts — Sale price lower than the face value of those debts — Assumption of responsibility by the purchaser for the recovery of those debts and for the risk of defaulting debtors)