Stored Functions In Subselects

Hello @community,

I have a special problem.
I use under MS SQL 2005 a user-function which i use to check rights in my system . This function is used in a subselect in my queries.
Using MS SQL 2000 I have problems with this. The function itself works fine. It also works in the subselect if I use constant parameters for @matchids
If I user a column from the main select I get an error message. Server: Nachr.-Nr. 170, Schweregrad 15, Status 1, Zeile 7.

Here is my function:

CREATE FUNCTION sf_MatchRights
(
@uid int = 0,
@matchids varchar(4000) = '',
@delimiter char(1) = ','
)
RETURNS @results TABLE ( returncode int )
AS
BEGIN
INSERT INTO @results VALUES (2)
DECLARE @value int

DECLARE cur CURSOR LOCAL FOR
SELECT [value] FROM fn_Split (@matchids,@delimiter)

OPEN cur
FETCH FROM cur INTO @value

WHILE @@FETCH_STATUS = 0
BEGIN

IF ( @value = @uid ) UPDATE @results SET returncode = 1
IF ( @value < 0 )
BEGIN
IF (SELECT COUNT(*) AS Counter FROM krgroupusers WHERE luserid=@uid AND lgroupid=(@value*-1))>0 UPDATE @results SET returncode = 1
END
FETCH NEXT FROM cur INTO @value
END

CLOSE cur
DEALLOCATE cur
RETURN
END

And here my select:

SELECT lid, dtcreation AS xTime, dtedit AS xActivity, xstitle AS xTitle, xtcomment AS xDesc, lcreatorid AS xUid, 10024 AS xAppid
FROM xinnovator
WHERE xinnovator.xlcontact=@contact
AND (lcreatorid=@uid
OR (xlcategory IN (SELECT lid FROM xinnovatorcats WHERE (SELECT returncode FROM sf_MatchRights (@uid, xinnovatorcats.xtqkmembers,','))=1))
)

If I replace xinnovatorcats.xtqkmembers with e.g. '1|2|3', then it works.

I know I can use columns from main selects in the subselect, too. But it seems I make something wrong with the syntax in sql2000 which works fine under sql2005.

I am thankful for any help.

PS: Here is the split function I use inside die MatchRights function... made it once. Dont run this with tons of rows .

CREATE FUNCTION fn_Split(@text nvarchar(4000), @delimiter char(1) = ',')

RETURNS @Strings TABLE
(
position int IDENTITY PRIMARY KEY,
value nvarchar(4000)
)

AS
BEGIN

DECLARE @index int
SET @index = -1

WHILE (LEN(@text) > 0)
BEGIN
SET @index = CHARINDEX(@delimiter , @text)
IF (@index = 0) AND (LEN(@text) > 0)
BEGIN
INSERT INTO @Strings VALUES (@text)
BREAK
END
IF (@index > 1)
BEGIN
INSERT INTO @Strings VALUES (LEFT(@text, @index - 1))
SET @text = RIGHT(@text, (LEN(@text) - @index))
END
ELSE
SET @text = RIGHT(@text, (LEN(@text) - @index))
END
RETURN
END