SET NULL OFF
CREATE CURSOR testDefault (f1 i NULL DEFAULT NULL)
INSERT INTO testDefault VALUES (NULL)
INDEX ON F1 FOR NOT ISNULL(F1) TAG T1 CANDIDATE
* #1 - the following BLANK doesn't fail even w/o DEFAULT clause
* !!! Sergey we do a error here, the index filter the rows and blank do none at eof
BLANK 		&& DEFAULT
* #2 - ignore the error
GO 1
BLANK 		&& DEFAULT
* #3 - ignore the error
UPDATE testDefault SET F1 = F1

* #4 - Index is corrupted at this point - ignore the error
* it is not in corrupted state, but VFP compare and check the current key with the old key
REPLACE RECORD 1 f1 WITH 1

* #5  Error on the BROWSE command : Index does not accept NULL. - ignore the error
* This occur because into a BROWSE with a FILTERED active index, 
* VFP evaluate the key FOR index cyclical ( it is correlate with the REPROCESS task )
BROWSE LAST NOWAIT

* #6 - deactivate the index, and you can look the table
SET ORDER TO
BROWSE LAST NOWAIT
RETURN