You can pass it in the context or using the active_id from register payment model, you can access the invoice

thank you , but How is that through FONCTION

The account move is not linked with account payment register but it's linked with account move line (many2many field in account payment register) and the amount which shown in account payment register is calculated from invoices lines.

Another thing the you can register payment for multi invoice for the same vendor so from which invoice you want to transfer the data.