I am having an issue with my Sharepoint documents library. Users are unable to update the documents. Whenever the checkout a document to edit (be it excel or word doc) an error message appears at the top of the document:
To save to the server, correct the invalid or missing required properties.
All the required properties are filled in but I have one required property that is of external data type. When I make that property not required, the error message disappears and I am able to save the document.
