I have a closed term set in my MMS which is linked to a content type in a document library, I uploaded a document into the library and accidentally set the value on that column. When I try to remove that value and leave it blank, SharePoint resets the value of that field to the initially selected value however I need it to be blank. I tried to download a copy of the document, go into the meta data in Excel and remove everything and then saved the document under a different name. However when I re-uploaded this new document it automatically sets the value back.
No matter what I do, I can't blank that column for the selected document. Do I need to have a blank value in my term set or am I missing a setting? I have been through the library settings and content type settings but can't seem to see any options to allow null values.