I have had customers view their quotations (estimates) via the client side portal, and then they have accepted the quotation. We get an email from zoho to tell us the client has accepted the quotation. But we then have to emailthe customer, or call them and ask for an order number, so I can put the order number on the draft invoice. when a client accepts a quotation, they need to be given the option to fill in an order number. No customer places an order without an order number anymore.