What can you do if you want to change a line item on an invoice assigned to a project?

Editing the original invoice is the correct action to take when you want to change a line item assigned to a project. In Xero, invoices are linked to projects for tracking purposes, and any modifications to the invoiced items should be done within the original invoice itself. By making changes directly to the invoice, you ensure that the project reports and financials accurately reflect the updated information and that all related financial records remain consistent.

Adjusting the line item directly within the project or creating a new project for changes would not effectively address the need to update the invoice itself. Deleting the entire invoice is also not a practical solution, as it would remove all transaction history and data associated with that invoice, complicating tracking and record-keeping. Therefore, editing the original invoice is the most efficient and responsible way to manage changes to line items assigned to a project.