I was thinking the same exact thing.  I have to go to the Invoices list to edit the invoice for the current job.  If I hit "Create Invoice" within the job screen, it creates a second invoice for the same job.  Not good.

Yes, the problem is - if you do not see there is an invoice created already for a particular job - you will most likely click to create a new one in order to reflect any changes to the invoice positions that are configured in the job. However, this will not create a completely new invoice, but a subsequent one to the initial invoice.

So, if I could see there is already an invoice in place, I can go in and click Reload data from job and the existing invoice is properly updated.

Hi Tom! Agree, we'll add in the next version! Promise )