Its boss, Roopa Kudva, says that in the mid-1990s it downgraded lots of its ratings and saw customers pull business from it as a result.

ECONOMIST: Credit-rating agencies

Elsewhere, Hertha Berlin were held 0-0 at home by Borussia Moenchengladbach and new Hanover boss Mirko Slomka got off to a losing start when his side were beaten 1-0 at mid-table Mainz while Stuttgart edged a 1-0 away win over Freiburg on Friday night.

CNN: Robben snatches victory for Bayern