[rd4407]

In versions prior to 2.2, I was able to set a custom column tag via its drop down selection.

Now I get an error message:

calibre, version 2.2.0
ERROR: Failed to set data: Could not set data, click Show Details to see why.

Traceback (most recent call last):
File "site-packages\calibre\gui2\library\models.py", line 1031, in setData
File "site-packages\calibre\gui2\library\models.py", line 1057, in _set_data
File "site-packages\calibre\gui2\library\models.py", line 1023, in set_custom_column_data
File "site-packages\calibre\db\legacy.py", line 653, in set_custom
File "site-packages\calibre\db\cache.py", line 1024, in set_field
File "site-packages\calibre\db\write.py", line 513, in set_books
File "site-packages\calibre\db\write.py", line 523, in set_books_for_enum
File "site-packages\calibre\db\write.py", line 290, in many_one
File "site-packages\calibre\db\write.py", line 246, in get_db_id
File "site-packages\calibre\db\backend.py", line 793, in execute
File "c:\cygwin64\home\kovid\sw\build\apsw-3.8.2-r1\src\cursor.c", line 231, in resetcursor
ConstraintError: ConstraintError: UNIQUE constraint failed: custom_column_4.value

Is there anything I need to do to, or is this a bug?

Edited: This problem affects the last item only, which I rarely use, so I don't know how long the problem may have been there.