In previous versions of TAS Professional it was either allowed or required that you use a type V field when you wanted to create a compound index.  This hasn't been the case for some time, however, with the move to CodeBase this is now no longer functional.  Due to differences in the way the buffers and indexes are maintained in Btrieve and CodeBase you must enter compound indexes as a regular index with multiple segments.

Page url: http://www.cassoftware.com/tas/manual/usingtypevfields.htm