Constraint violation on update

Question

I have a table with two linked columns, a compulsory boolean and an optional date. There can only be a date when the boolean is FALSE. So I have this structure:

CREATE TABLE FOO (
    FOO_ID INT IDENTITY(1, 1) NOT NULL,
    MY_DATE DATETIME,
    MY_BOOLEAN BIT DEFAULT 0 NOT NULL,

    CONSTRAINT FOO_PK PRIMARY KEY (FOO_ID)
);

And I've written this constraint to keep the data integrity:

ALTER TABLE FOO
ADD CONSTRAINT FOO_CHK CHECK (
    MY_BOOLEAN=0 OR MY_DATE IS NULL
);

I must be missing something obvious but the fact is that I cannot run this update query:

UPDATE FOO
SET 
    MY_BOOLEAN=1,
    MY_DATE=NULL
WHERE FOO_ID=31416

I get a check constraint conflict error and the update fails. What am I doing wrong?

---

UPDATE

I regret to inform that I had mistyped a column name... Sorry for wasting your time. I wish I could remove the question :_(

Answer 1

I've tested this with this script and get no errors. Is there any other constraint?

CREATE TABLE FOO (
    FOO_ID INT IDENTITY(1, 1) NOT NULL,
    MY_DATE DATETIME,
    MY_BOOLEAN BIT DEFAULT 0 NOT NULL,

    CONSTRAINT FOO_PK PRIMARY KEY (FOO_ID)
);
ALTER TABLE FOO
ADD CONSTRAINT FOO_CHK CHECK (
    MY_BOOLEAN=0 OR MY_DATE IS NULL
);

set identity_insert foo on
insert into foo(FOO_ID, my_date, MY_BOOLEAN)
select 31416, '20090101', 0
set identity_insert foo off

UPDATE FOO
SET 
    MY_BOOLEAN=1,
    MY_DATE=NULL
WHERE FOO_ID=31416

Answer 2

Sorry, bogus question (self-reply seems to be the only way to close it).