As you most probably have outstanding Invoices in your ‘old’ system, these can be added into Ostendo by firstly going into Sales>Settings>Sales Rules and amending field ‘Direct Invoice Numbering’ from Automatic to Manual. You should then go into Sales>Direct Invoicing and create Invoices that reflect the current Outstanding Invoices. Having entered the current outstanding Invoices you may wish to amend the ‘Direct Invoice Numbering’ mentioned above back from Manual to Automatic. You can set the Start Number of the auto-generated number by going into File>System Configuration>System Settings and clicking on the ‘System Numbering’ tab. It is strongly recommended that you enter a start number of (say) 1000001 and not 1 due to the sorting sequence used when displaying Invoices.