Using version 7, I created two sales orders for a customer. I left the "customer reference" info blank on the first one, and filled it in on the second one.

I noticed that when I started with a customer quote, then moved it to a sales order, and inside the sales order I entered the PO in the "customer reference" field, and then validated it and created an invoice, the sales order disappeared from the list of customer sales orders and from the list of sales orders for that particular customer. The invoice was listed in the list of invoices, but it was not listed in the sales orders page. Also, when looking at the customer, it only lists the previous sale and not the new one.

I would also like to know what data goes into "Customer Code" on the printed invoice. What field controls this field?