Hey there,

Sounds like you're stuck with a proforma invoice that jsut won't budge. been there! When an invoice is in a proforma state, it usually means it's pending validation. But if you can’t cancel or edit it, Odoo might be acting up due to misconfigured permissions or some data weirdness.

So, first up, double-check your user permissions. You gotta have the right access rights, especially in the accounting/finance roles, to mess with invoices properly. If that's all good, maybe look into custom modules or server actions that might be screwing things up. Customizations can lock things down without you even noticing.

Another thing to try is lookin at the invoice's journal settings. If it's not linked to any journal, that’s prolly why it's not moving. You might need to create or assign it to a specific journal entry first.

And yeah, if you're still stuck, try duplicating the invoice and then voiding or archiving the original - keeps you records clean. I’ve had to do this myself once; it's kinda tricky but works like a charm.

Regards!