Kenneth Nielsen has found a bug in Master Data Services:
Something is not right here, there are some inconsistency in the way MDS behaves in regard to attribute management.
- Changes to an attributes length is not supported in web interface
- Changes to an attributes length is supported in Excel Add-In
- Changes to an attributes length is limited to max 1000 in Excel Add-in
- New attributes support a length of max 4000 in web interface
- New attributes support a length of max 1000 in Excel Add-in
- It is not at all possible to change an attributes length once it is set to 4000
With SQL Server 2016 CTP 3.1, Nielsen found a couple of these have been corrected, but not all of them.
Update, 2016-01-04:
Kenneth notes that the bug will be fixed in CTP 3.3. Very nice.