You can change Keyword Values, or re-index the document as an entirely different Document Type with appropriate Keyword Values.
It is important to review the process on a regular basis to verify that all Keyword Values are being completely obtained and that the Document Types are being correctly identified. It is possible that a Keyword Value's field location has changed in the XML Import Index File, so that OnBase is pulling the wrong Keyword Values. This may not generate an error, and the only certain method to stop this situation is to look at the document and its Keyword Values.