Field disappears on cloned invoice

I cloned a sales invoice and deleted the contents of the Order Number field so I could input a new number - but the whole Order Number field disappeared. Is this a bug? I’m on version 22.6.20.

No. That field has been eliminated and only shows in situations where content already existed. You must now select sales order numbers from the dropdown number that appears when a customer is selected. See Create sales invoices | Manager. This change has been the subject of several recent forum threads.