Accessors used with IRowsetIndex::SetRange and IRowsetIndex::Seek for an integrated index follow the same restrictions as accessors used with these methods for a separate index:
Accessors used with SetRange and Seek for an integrated index can also be used with other methods, such as IRowset::GetData, and vice versa.
Because the order of significance of columns may change for each index, it is usually necessary to define a different accessor to be used on SetRange or Seek calls for each index.