A presidential decree will be issued within the next several days to devalue the Soviet ruble in January 1991 as a step toward a convertible currency, officials said Friday.

Details of the devaluation plan and the new rates were not released, but the officials said the move was designed to eliminate multiple artificial exchange rates that affect Soviet enterprises that now deal with hard currency."Without changing our (currency exchange) system, we cannot fit in the world process," Deputy Finance Minister Vladimir Raevsky said.