Depending on the volume of sales order we have in Hungary, we usually don't bill them until a given day - so no set day. We usually mark those SO's as "on Hold -> do not bill ." When we batch-invoice our SO's every day, any SO marked "on Hold" doesn't get invoiced. The reason we don't want to invoice those is that we must submit the invoice to the Tax authorities in Hungary the same day the invoice(s) is/are issued. So our Tax department will dedicate a given day to submit many invoices to Hungrian Tax Authorities instead