Hello,

We are in v14 Odoo Enterprise Online and are facing something we struggle to manage. We purchase a service with annual commitment for which we are billed monthly. Ideally, the perfect tools would be the same module as subscriptions but on the purchase side.

Our main need is to be able to check at anytime the total amount that has been already billed and the one left to be billed for the next months. 

Does anyone have a good idea on how to create an "open" PO on which we could attached multiple invoices we receive to keep tracking the remaining amount due. That would be like multiple advance payments linked to a single PO.

Thank you for your help