We've been using Odoo for a month now and are now looking to move our accounting system into Odoo too.

How do we record invoices that have been issued under the previous accounting system but not yet paid? I can obviously create these as new invoices against the customer but the invoice numbering will then be different. Is there a way to record the invoice and set the previous invoice number to match?

I assume that when I create these invoices it will generate the corisponding accounting entries so when entering opening balances I should deduct these amounts from Accounts Recievable etc to make sure that the totals are then correct?

Thanks