Thank you. But I would like to go further.
I would of course never use direct INSERT SQL queries for sales, invoices etc... but to import partners and products, at the setup of a new database, it would make sense to try, especially with thousands of references.
CSV and even XML-RPC imports are -unfortunatly- rather slow.
Some people seem to use SQL to import products, successfully (videos on youtube).
On a fresh DB install, I've noticed that if I choose a "chart of account", and then create a partner, the compulsory fields for the partner "account receivable" and "account payable" are automatically filled.
But OpenERP doesn't create records in ir_property table.
However, when I choose a payment term for a partner, or if i change the AR or AP accounts, then records are added into the ir_property table.
So i'm rather lost.
I believe it would be good for the community to have a clear understanding of the mechanism, regarding importation of products (the most important point) and partners, in order to know once and for all if a proper set of direct INSERT SQL queries could do the job.