The Germiston Municipal Retirement Fund (the Fund) was established in July 1924 as a defined benefit fund and converted in 1994 to a hybrid fund with primarily defined contribution features. The Ekurhuleni Metropolitan Municipality (the Municipality), successor to Germiston Municipality, was the principal employer participating in the Fund. Rule 10.8(1) (formerly rule 43.1) provided that if the rate of interest earned on the Fund's total moneys during any financial year was lower than 5.5%, the Municipality must contribute to make up the difference. In the financial year 1 July 2002 to 30 June 2003, the Fund's assets diminished in value by -4.3%, the first time it had not achieved at least 5.5% growth. The Fund claimed R61,173,822 from the Municipality to make up the difference between the -4.3% loss and the 5.5% return required by the rule. The dispute centered on whether 'interest actually earned' included unrealized capital gains and losses based on market value (the Fund's position) or only realized gains on assets actually sold (the Municipality's position).