Mandatory Enumaration without literal 'other'

The Enumaration 'MeasuredOrDerivedDataTypeEnum' is used in a mandatory way in 'MeasurementSpecificCharacteristics', but does not offer some literal like 'other'. Such a literal might be necessary in case of a Level B Extension, if someone wants to expand or replace this Enumaration. --> Add literal 'other' to MeasuredOrDerivedDataTypeEnum and have a look through the model, if there are more situations like this (maybe even create a rule for that).