The chart of account is used to account for all your transactions, in compliance with your local regulation; This is the objective of the accounting module, using a local chart of account that fits your needs or obligations. To make it simple, each expense or revenue is recorded in expenses or revenue accounts.

In addition, to this "legal" view of your business, you may need to have additional information, for instance by operational projects or by any other perspective that is relevant and useful to run and improve your management. this is where analytical accounting is used for.

Odoo allows to record the operations BOTH in the legal accounting And the Analytical modules. This double recording is made in a single operation.