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This section of ISOM was changed in 2002, see here
5.1 General

Maps for ski orienteering are based on the specifications for foot-orienteering maps. However in order to meet the specific requirements put on the map by the nature of ski orienteering, certain deviations and additions to the foot-orienteering map specification is needed. These special rules and symbols are described in this chapter.

Deviations from the specifications are permissible only with the sanction of the national Ski-O Committee. For international events, sanction must be given by the IOF Ski-O Committee. Complete foot-orienteering maps may be used in ski-o competitions at all levels, if the dark green (symbol 410) is replaced by light green (symbol 406). For international events, permission from the IOF Ski-O Committee is required.