Hello, I have Odoo 8.

I register payments from the customers and then I register invoices to its customers. So, for instance, I have a payment of $1000 and two invoice sales of $100 each one. I want to set that the two invoices are paid and the customer has +$800 balance.

I register the 3 documents and then go to Accounting > Periodic Processing > Reconciliation -> Manual reconciliation and check the three documents, press "Concile" and then press "Partial conciliation" but nothing happens.

What is the way to set the two invoice paid and the +$800 balance for the customer, in the example? Thanks!