Need to create an invoice to different customer than set in project

Hello,

I have created a project with a customer as partner and sent him an offer.
Now the invoice must be addressed to a different customer, but is automatically set to the project customer when created from the offer and can’t be changed.
Even when creating it from scratch I can only assign the project customer as long as the project is set in the invoice.
Removing the project from the invoice I can bill any customer, but then the invoice is no more linked to the project.
Is there any way to accomplish this? Thanks.

Ok, have found it: In the invoice, second tab (addresses) I can add a different company as billing address.