Detect duplicate sales invoices, just like it does for costs. I have no idea why you would not have this feature for sales invoices already. It seems Dext does not focus on sales in any way as this is not the only missing feature for the sales side.

Like costs, clients upload duplicate sales sometimes when they don't realise we already have that one. It's hard to spot unless you know what you're looking for. There should be a feature showing duplicate sales

Dext is unable to detect duplicate sales invoices uploaded by different Dext users. The same invoice can get posted multiple times if not careful.