The possibility of choosing 1990 or 1991 as the reference year will cause transitional problems which need to be regulated; whereas, while ensuring that the total number of existing rights is not increased above the number of acquired or potential rights corresponding to the reference year chosen, provision should be made for an initial allocation of rights to farmers in well-defined situations; whereas, in order to take account of the exceptional circumstances which prevented producers form applying for a premium for the year or years following the reference year, while having obtained a premium for the reference year, provision should be made for such producers to receive rights from the national reserve.
