Bug - Optional field cannot be left blank

Can you please specify what section has this issue?

This is in the Internal Controls sections. I also observed when trying to do a bulk upload that it would not let me leave the maintenance date column blank, although it said it was optional. Not sure if this is user error or an actual bug

It seems it a wording issue.
Thank you for the feedback!

Internal reference:https://github.com/eramba/eramba_v2/issues/2236