You cannot modify document properties by using the content crawling and search feature in SharePoint Portal Server 2003 (826889)

CAUSE

The indexable and retrievable flags on some searchable document properties cannot be changed; this helps to maintain consistency with some other SharePoint Portal Server features.

The following list is a list of the properties that you cannot modify in SharePoint Portal Server:

        DAV:contentclass
        DAV:displayname
        DAV:getlastmodified
        DAV:getcontentlength
        DAV:getcontenttype
        DAV:href
        DAV:iscollection
        DAV:parentname
        urn:schemas-microsoft-com:sharepoint:portal:objectid
        urn:schemas-microsoft-com:sharepoint:portal:profile:Department
        urn:schemas-microsoft-com:sharepoint:portal:profile:PictureURL
        urn:schemas-microsoft-com:sharepoint:portal:profile:PreferredName:0
        urn:schemas-microsoft-com:sharepoint:portal:profile:PreferredName
        urn:schemas-microsoft-com:sharepoint:portal:profile:Title
        urn:schemas-microsoft-com:sharepoint:portal:profile:WorkPhone
        urn:schemas-microsoft-com:sharepoint:portal:profile:WorkEmail
        urn:schemas.microsoft.com:fulltextqueryinfo:cataloggroup
        urn:schemas.microsoft.com:fulltextqueryinfo:displaytitle
        urn:schemas.microsoft.com:fulltextqueryinfo:description
        urn:schemas.microsoft.com:fulltextqueryinfo:rank
        urn:schemas.microsoft.com:fulltextqueryinfo:sitename
        urn:schemas.microsoft.com:fulltextqueryinfo:sourcegroup
        urn:schemas.microsoft.com:fulltextqueryinfo:sdid
        urn:schemas-microsoft-com:office:office#Author
        urn:schemas-microsoft-com:office:office#Description
        urn:schemas-microsoft-com:office:office#Keywords
        urn:schemas-microsoft-com:office:office#ows_CrawlType
        urn:schemas-microsoft-com:office:office#ows_ListTemplate
        urn:schemas-microsoft-com:office:office#ows_SiteName
        urn:schemas-microsoft-com:office:office#ows_ImageWidth
        urn:schemas-microsoft-com:office:office#ows_ImageHeight
        urn:schemas-microsoft-com:office:office#Subject
        urn:schemas-microsoft-com:office:office#Title
        urn:schemas-microsoft-com:publishing:Category
        urn:schemas-microsoft-com:publishing:ShortcutTarget