I file this under 'things learned along the way'. I just discovered this tonight when importing Main accounts into a GOLD environment with the 'Exchange rate type' field populated in the source file. There must exist at least one Exchange rate in the Exchange rate table for each Exchange rate type imported.
Without one Exchange rate setup, the DIXF job will throw this error for each record that has that Exchange rate type assigned to it.
Note that 'Foreign currency revaluation exchange rate type' = Exchange rate type in the Main account form.