When a user attempts to archive a document using interactive ad-hoc archival, the Keyword Type fields may be missing.
This behavior typically indicates the SharePoint value is incompatible with the data type of the OnBase Keyword Type. Specifically, an incompatible SharePoint column may be mapped to a date/time Keyword Type in OnBase.
Check the column mapping for the content type, and address any incompatibility issues. For more information, see Compatible Data Types.