Correlated Subquery - Column Prefix 'OJ' Does Not Match With A Table Name Or Alias Name Used In The Query.

I have data in a table (@Outer) that I am matching to a lookup table (@Inner) which contains multiple "matches" where nulls can match any value. By sorting the inner table and grabbing the top record, I find the "best" match. I know the sort and the null matches work but I don't understand why the correlated sub query below doesn't understand that the OJ prefix refers to the outer table.DECLARE @Outer TABLE (
OuterID int IDENTITY (1, 1) NOT NULL,
MethodID int NULL,
CompID int NULL,
FormID int NULL,
InnerID int NULL
)

INSERT @Outer VALUES (2, 2, 2, NULL) -- OuterID = 1
INSERT @Outer VALUES (3, 2, 1, NULL) -- OuterID = 2

DECLARE @Inner TABLE (
InnerID int IDENTITY (1, 1) NOT NULL,
MethodID int NULL,
CompID int NULL,
FormID int NULL
)

INSERT @Inner VALUES (2, null, null) -- InnerID 1
INSERT @Inner VALUES (2, null, 1) -- InnerID 2
INSERT @Inner VALUES (2, 2, null) -- InnerID 3

INSERT @Inner VALUES (3, null, null) -- InnerID 4
INSERT @Inner VALUES (3, 2, null) -- InnerID 5

INSERT @Inner VALUES (4, 2, 1) -- InnerID 6


-- UPDATE Outer Table with best match from Inner table
UPDATE @Outer SET
InnerID = IJ.InnerID
FROM @Outer OJ
INNER JOIN
(
SELECT TOP 1 I.*
FROM @Inner I
WHERE IsNull(I.MethodID, OJ.MethodID) = OJ.MethodID
AND IsNull(I.CompID, OJ.CompID) = OJ.CompID
AND IsNull(I.FormID, OJ.FormID) = OJ.FormID
ORDER BY I.MethodID DESC, I.CompID DESC, I.FormID DESC
) IJ ON OJ.MethodID = IsNull(IJ.MethodID, OJ.MethodID)
AND OJ.CompID = IsNull(IJ.CompID, OJ.CompID)
AND OJ.FormID = IsNull(IJ.FormID, OJ.FormID) SELECT * FROM @Outer

The result should be OuterID 1 matched to Inner ID 3 and OuterID 2 matched to Inner ID 5.

Can anyone help me? Thanks in advance.