Bills - Duplicate warning when emailing bills into Xero
If you enter a duplicate supplier invoice via an email link into Xero bills, then Xero should advise/warn you that there is already an invoice in the system with the same reference/ amount. There should be the same warning that is given when a duplicate invoice is loaded into Xero bills manually.

Hi team, pleased to share that duplicate detection has now been released and available to you all. Xero will compare the Contact, reference and amounts of bills and credit notes in your org to help identify possible duplicates. You can then go to the Review page to take action on any Unpaid bills (Draft or Awaiting Payment).
While Paid bills will also be picked up, if you need to take any action or view bills you'll just want to return to the bills list to access these.
Thanks for your interest and staying looped in with us through the idea, here.
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Suzie Tay commented
I am still waiting for Community manager to come back for duplicate bill alert function =/
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Michelle McHutchison commented
If this is an important feature when keying a bill in the system, I don't know how it's not an important feature when emailing a bill.
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Adrienne Short commented
It would be awesome if this was a comment instead of having to open the supplier invoice to view that it is duplicated. A check on email one coming through is imperative
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Marshall Burson commented
Not only for bills, but for invoices as well.
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Dee Wilson commented
I am positive this used to be a thing! I agree it needs to be there and can not be that difficult for xero to bring back.