3c28be1b33ea18be7280d9372ebd53a54140da86 enforced readonly by default on computed and related fields, but some fields were not changed to be readonly, leading the application to crash when editing them. This commit fixes that by introducing new fields to write on instead of the readonly ones. Follow-up of task-2955927. closes odoo/odoo#99253 Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>