The source document is read-only. Verify that the document is not locked or under change by another user.
The destination document is not the latest revision. Wait for the next publishing job to run for the latest revision or resubmit the document.
The user account under which Dex.exe runs does not have sufficient destination system privileges to update the document properties. Assign the account sufficient privileges.
The document is under change by another user. Wait for the next publishing job to run for the latest revision or resubmit the document.