I created an invoice a few days ago (consulting style, i believe) with only one record of information. When i go to edit the invoice, and then click on "Add Invoice Item," the Add Invoice Item page sucessfully comes up, but when i click to submit it the screen just turns blank. Literally, completely blank. The URL in my browser when this happens is: index.php?module=invoices&view=add_invoice_item
I have a similar issue: if I create a new invoice-consulting and I save it without a items and after I edit this invoice and I fill in the form for a new item to add, when I click on save it gives an error message from MySQL. It does the same on the demo.