derivation-ok-restriction.2.1.1: Error for type 'aa....aa'. The attribute use 'bb....bb' in this type has a 'use' value of 'cc....cc', which is inconsistent with the value of 'required' in a matching attribute use in the base type.

This is an error for the type aa....aa. The attribute usage bb....bb in this type has a use value of cc....cc. This value contradicts the value of required in the matching attribute usage of the base type.