[Koha] Location and item information (Marc 952) from Koha 2.x to 3.14

[Giuseppe Angilella]

Hi,

I'm in the progress of updating my Koha system here from 2.x to 3.14 (a 
giant leap, seemingly!)

After using the built-in migration scripts and fixing many local 
inconsistencies, I am left with the Koha-to-Marc mapping of the subfields 
in the 952 tab (Location and item information).

I am keeping Koha 2.x Marc framework as a default, and using Koha 3.14 
Marc framework to catalogue all new biblios and items. I plan to edit all 
old biblios (and items) gradually and individually, change them into the 
new framework, and fill in the missing fields.

However, although this seems to work with biblio records, some 
inconsistencies seem to remain with existing items. After editing and 
changing framework for a given biblio, I can only edit existing items 
through the "barcode" link. The framework structure for tag 952 in Koha 
3.14 then appears (with most fields blank, of course), and the itemnumber 
showing in the 952.u subfield, now reserved for the Uniform Resource 
Identifier. Other values are also assigned to wrong fields, both in the 
intranet form for cataloguing and in the Opac.

I would expect that filling the (new) fields correctly and saving would 
result in an updated item, now belonging to and complying with the (new) 
framework. In particular, I would expect that a further attempt at editing 
the same item would show the correct values filling the appropriate 
fields. But this is not the case: even though I can check (via direct 
access to the mysql database) that any modification has indeed taken place 
as desired, it seems as if the item is still interpreting those values as 
corresponding to fields arranged as in the old Marc framework.

(The bibliographic framework test returns OK, with all the columns in the 
items table mapped to the 952 subfields as in the "new" framework.)

On the other hand, items belonging to biblio records still in the default 
(old) framework are displayed correctly.

Is the Marc framework only specific to biblio records? Shouldn't it be 
possible to have items belonging to different frameworks?

Can two frameworks with different Koha-to-Marc mappings in the 952 tag, as 
in my case, coexist?

Any comment and hopefully help would be greatly appreciated!

Many thanks,

Giuseppe.