Contract number: [ complete ]  Service contract conditions of December 2018  II.18.4. Effects of termination ......................................................................... 33$_{ }$ II.19. Invoices, value added tax and e-invoicing....................................................... 33$_{ }$ II.19.1. Invoices and value added tax .............................................................. 33$_{ }$ II.19.2. E-invoicing ......................................................................................... 33$_{ }$ II.20. Price revision ................................................................................................... 34$_{ }$ II.21. Payments and guarantees................................................................................. 34$_{ }$ II.21.1. Date of payment.................................................................................. 34$_{ }$ II.21.2. Currency ............................................................................................. 34$_{ }$ II.21.3. Conversion.......................................................................................... 34$_{ }$ II.21.4. Costs of transfer.................................................................................. 35$_{ }$ II.21.5. Pre-financing, performance and money retention guarantees ............ 35$_{ }$ II.21.6. Interim payments and payment of the balance ................................... 35$_{ }$ II.21.7. Suspension of the time allowed for payment...................................... 36$_{ }$ II.21.8. Interest on late payment...................................................................... 36$_{ }$ II.22. Reimbursements .............................................................................................. 37$_{ }$ II.23. Recovery.......................................................................................................... 37$_{ }$ II.23.2. Recovery procedure ............................................................................ 37$_{ }$ II.23.3. Interest on late payment...................................................................... 38$_{ }$ II.23.4. Recovery rules in the case of joint tender........................................... 38$_{ }$ II.24. Checks and audits ............................................................................................ 38$_{ }$ 5 