enumServiceException.type in CMIS-Messaging schema is not defined in part 1 or part 2 exceptions

It is not clear what this is:
<xs:simpleType name="enumServiceException">
<xs:restriction base="xs:string">
...
<xs:enumeration value="type" />

The specification used to define typeNotFound. It is not clear if this should be defined or simply removed from the schema.