I have created a List A and a Discussion Board B. In order to link discussion in B with the item in A, I created a lookup column which get the value ID from item in A. This works pretty well when I create a new discussion in B, I can click on the lookup column to view the item in List A.

However, the problem is when I reply to the discussion, an error appears. It says that "File not found".

I believe that this is because the lookup column does not know which value to set. Can anyone help me to solve this problem?

enter image description here

1 Answer 1


I have recently found the solution for this!!!

It looks like a bug in SPO. If I don't use "#" in the subject then everything looks good. However, if I put the # in, the error will appear!

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.