The reason for the discrepency is that MARC21 defines subfield t in the linking fields (76X-78X) as:

"Title information from subfields $a, $f, $g, $k, $n, and $p of fields 130 (Main Entry - Uniform Title) and 245 (Title Statement) of the related record."

There is no place in MARC21 to put other title information/subtitle in a linking field (and more specifically in a separate subfield in a linking field).  If you are using MARC21, the subtitle should not be in the linking field in any case.

--Steve

Steve Shadle/Serials Access Librarian         shadle@u.washington.edu
NASIG President
University of Washington Libraries              Phone: (206) 685-3983
Seattle, WA 98195-2900                            Fax: (206) 543-0854

On Tue, 22 Nov 2011, Marie-Pierre Henin wrote:

> Help please
>
> We're using Marc21.
> I'd like to know if there is a solution about this :
>
> 1. I've a bibliographic record with a 245 tag containing a subtitle in subfield b  (ex:  245    0    0    \a Intellectual news : \b review of the International Society for Intellectual History)
>
> 2. I've a bibliographic record with a 780 tag record linking to the 245 tag of the first record.  (ex: 780    0    0    \t Intellectual news : review of the International Society for Intellectual History \x
> 1561-5324)
>
> 3. I've a bibliographic record with a 785 tag record linking to the 245 tag of the first record.  (ex: 785    0    0    \t Intellectual news : review of the International Society for Intellectual History \x
> 1561-5324)
>
> I'm searching in the client and in the opac the journal title : Intellectual news : review of the International Society for Intellectual History
> and the result is 2 differents entries :
>
> 1 Intellectual news : review of the International Society for Intellectual History  (coming from the 245 tag of the record 1)
> 2 Intellectual news : review of the International Society for Intellectual History  (coming from the 780 & 785  tags of the records 2 & 3 which match together )
>
>
> The reason is that  there's no subfield b appropriate to a remainder of title  in the 78X tags.
>
> Do you have a solution to get this result :
>
> 3 Intellectual news : review of the International Society for Intellectual History (matching of all 245 and 78X fields )
>
>
> Henin Marie-Pierre
> Serials Librarian
> Académie Louvain / Fundp Namur
>
>
>
>