OK, my guess is that it’s the wrong form type. Sales Order forms come in three types -“Standard Sales Order - Cash Sale” this will only bill to a Cash Sale and therefore won’t allow a deposit - “Standard Sales Order - Invoice” Invertly, this will only allow Invoices to be created - this will allow deposits. Finally “Standard Sales Order” this one automatically works out the type based upon whether there’s any payment data in it. If there’s payment data, it creates a Cash Sale, if not it creates an Invoice. Once it’s been customised you can’t easily tell which form it is