Comment 5 for bug 1083592

I added a branch in which I do a check to know if the partner emailid exists in openerp but under a different external_reference.

When it happen, the partner which might be an old outdated partner I update the old partner before we try to update the partner of the sale order.

So this error shouldn't be raised again unless you have some inconsistent data.

Regards,
Yannick