Sales Invoices - Ability to bulk edit/update invoices
Ability to upload changes to existing invoices via csv.
Currently - When uploading a list of invoices that already exist, Xero will not allow the upload to continue. This feature would mean, that for any invoice that exists already, Xero would prompt the user whether they would like to update changes for existing invoices or not.
Purpose example - For invoices that need to have changes applied, for example amending the due date to an agreed revised payment due date. This change would enable the user to bulk update instead of needing to open each invoice manually and edit each one. (With hundreds of invoices that need amending regularly it would mean a large cost saving to some customers).

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Sandy O'Neill commented
I send out invoices to groups eg Full Subs with email on July 1st. If these invoices are not paid by July 30th the amount on them goes up from $165 to $175 it would be great if I could update a particular group to this amount all at once and put in a message to advise currently I have to go into each individual invoice to update and then resend