[FIX] Wrong Identation in Doc
Do not write the backend_id when the field is a readonly 'related'.

It provokes MemoryError, if the cause is not known yet, it is better to remove these useless writes
backend_id on 'magento.sale.order' is *not* a related, we must keep it
[FIX] MemoryError when writing on backend_id when it is a readonly fields.related

Do not write the backend_id when the field is a readonly 'related'.

It provokes MemoryError, if the cause is not known yet, it is better to remove these useless writes
[FIX] Wrong Identation in Doc
Merge branch 'bzr/openerp-connector-7.0'
Merge branch 'bzr/openerp-connector-magento-7.0'