I'm not sure that matters, invoicing, we'll give you what rate by principles of accounting I will use the exchange rate before the date of the invoicing for 1 day.
I'm not sure about the invoice, that I would rate anything because in principle I take account of the exchange rate, one day before the date of invoice.
I"m not sure about the invoicing that we should rate, because by the principle of accounting, I will use the exchange rate first day out invoices 1 days.