Odoo database

Many to many

For every many to many field odoo creating new relations table for example pos_multi_rel with _rel postfix.

Odoo way of shaman

What to do if something not work but should to

1. Refresh page
2. Update module
3. Check openerp file depends, demo and other important fields
4. Check odoo config you use to run odoo. Especially addons paths
5. Uninstall and install again modules in depends
6. Clean browser cache
7. Carefully check logs. Look up if needed files loaded or not. May be some errors.
8. Create new base and install all modules.