A developing country Member or least developed country Member that considers itself to
be experiencing difficulty in implementing a provision that it has designated in Category
B or Category C by the definitive date established under paragraph 4.1 b. or 4.1 e., or in
the case of a least-developed country Member paragraph 4.2 b. or 4.2 f., and should
notify the Committee. Developing countries shall notify the Committee no later than 120
days before the expiration of the implementation date. Least developed countries shall
notify the Committee no later than 90 days before such date.