2.1.791 Part 4 Section 188.8.131.52, groupMember (OLAP Group Member)
a. The standard states that on and off are valid values of the group attribute.
Excel does not allow these values on this attribute.
This note applies to the following products: 2007, 2007 SP1, 2007 SP2.
b. The standard does not limit the length of the value of the uniqueName attribute.
Excel restricts the value of this attribute to be at least 1 and at most 65535 characters.