Fields missing in import when fields come with {'states':[]}

Version 5.0.12 on demo data

I create this csv file :

"ID","Name","Banks/Bank Type","Banks/Account Number","Banks/IBAN"
"base.res_partner_c2c","Camptocamp","iban",,"nl69pstb0001234567"
"base.res_partner_c2c",,"bank","000-0000000-000",

When I try to import it, (auto detect) openerp says in a window :

Import Error.

Error processing your first line of the file.
Field Banks/IBAN is unknown !

I tried also to put the iban in the "Banks/Account Number" field, but this doesn't work.

Where do I put the IBAN number in the file to get it imported ?

Thx