[Koha] MARC Check error

I have installed Koha 2.2.9 on Ubuntu 7.1 Server. When I run the MARC Checking setup in MARC21, 1 problem appears: item fields. ALL items fields MUST : - be mapped to the same tag, - and they must all be in the 10 (items) tab. Consequently, on the page “Add MARC Record With Framework: Default”, the number of the tags, the box of indicators and the letter of subfields not appear. I have reviewed the Biblio framework (MARC structure), but I do not find the error. Any idea? Jose Luis Alvarez IES Victoria Kent Library