Can anyone help me with this problem? I am su...

[Hong_Yaw_Kuang]

Can anyone help me with this problem? I am sure [Candidate Index] has been set as Key column, but it still pop up with this issue.

[tony1]

@Hong_Yaw_Kuang I don’t know the details of your use case, but the error message is saying that you’re using a single value where a list is expected.

LIST([Candidate Index]) will get rid of the error, but I’m not sure if it’s going to do what you expect.

[Hong_Yaw_Kuang]

Still the same error message, I wonder is this a bugs?

[tony1]

@Hong_Yaw_Kuang [Candidate index] should also be a ref column to a table, or a key column from the table you’re referencing.