Alex is correct. You must correct the error in the "manual upload".
But as a dirty trick to bridge the technical problem you can do this in the auth fields:
ABC -> real correct value "ABC"
Alt + 0160ABC -> Keying in 0160 while holding the "Alt" key down inserts the ASCII code of "space" into the field. So there an empty character there but it cannot be seen in the UI.
But again! You must fix the source of the problem! There is no guarantee that Alt-codes will work forever!
Cheers,
Julius