We need to invoice donations that are linked to analytic account. We have about 400 projects for which a user can make a donation. A project is linked to a analytic account and only 1 donation per invoice.

As I understand it correctly, openerp7/odoo uses an invoice based on the analytic account to which it is associated at item level.

This would mean that we need to add for every new project/analytic account a new product item to invoice that is linked to the analytic account.

I find this not a good maintanable approach.

So what would be a other approach to invoice projects and make sure that the invoice item is linked to the analytic account?