In the OOTB document library "Documents" I added a new column "Author". This column is from the type "user or group". It is also required. When I create a new document from the ribbon and try to save the document, it asks me to fill in the required fields. I see a red asterik on the field "Author", but I can not enter some value!! What is going wrong?
When I click inside the textbox nothing happen. I cannot type inside the textbox. Lools like it is disabled. There is also some warning "At this moment not available" inside of it.