Mmh the 3rd paragraph of my previous comment is confusing, the first 2 sentences (data duplication + impact on community modules) was related to the openerp solution, not partner_id + contact_id.
Mmh the 3rd paragraph of my previous comment is confusing, the first 2 sentences (data duplication + impact on community modules) was related to the openerp solution, not partner_id + contact_id.