ConstraintError on changing metadate of one "special" book

[Marco Hiller]

calibre, version 1.0.0
ERROR: Unhandled exception: <b>ConstraintError</b>:ConstraintError: column name is not unique

calibre 1.0 isfrozen: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
('Windows', '7', '6.1.7601')
Python 2.7.4
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Traceback (most recent call last):
  File "site-packages\calibre\gui2\metadata\single.py", line 496, in accept
  File "site-packages\calibre\gui2\metadata\single.py", line 469, in apply_changes
  File "site-packages\calibre\gui2\metadata\basic_widgets.py", line 1412, in commit
  File "site-packages\calibre\db\legacy.py", line 790, in func
  File "site-packages\calibre\db\cache.py", line 55, in ans
  File "site-packages\calibre\db\cache.py", line 906, in set_field
  File "site-packages\calibre\db\write.py", line 502, in set_books
  File "site-packages\calibre\db\write.py", line 288, in many_one
  File "site-packages\calibre\db\write.py", line 263, in change_case
  File "site-packages\calibre\db\backend.py", line 291, in executemany
  File "c:\cygwin\home\kovid\sw\build\apsw-3.7.17-r1\src\cursor.c", line 231, in resetcursor
ConstraintError: ConstraintError: column name is not unique

[Kovid Goyal (kovid)]

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