How to delete or modify an invoice

Choose "Create new invoice"
Go to Command bar > "Data"
Click "Edit" button next to the record you want to change, choose "Delete" or "Modify"

Please note deleting an invoice does not automatically remove items associated to the invoice.

How to delete or modify items associated to an invoice
https://allmyinvoices.aidaluu.com/article17.html

Invoice-level summary properties (user modifiable from Data view)

Invoice Number
Notes (Shown on invoice)
Internal Notes (Not shown on invoice)
Invoice Date
Due Date
Status

Invoice-level technical properties (system generated, administrative properties and fixed values in Data view)

Invoice record key (Primary Key)
Record creation timestamp
Record last modified timestamp
Linked business database record key
Linked customer database record key