If you need to edit an invoice that has already been archived, you'll first have to make sure the following user role is enabled:
Settings
Users
Click on a user then Archive > Edit archived supplier document details
Now you can go to your Archive.
Click on the account payable you want to edit then click on Edit properties.
If the imported file was a UBL, you'll only be able to edit the supplier.
If the imported file was a PDF, you'll be able to edit all of the invoice's data.
Once the necessary changes were made, click Save.
Note: accounts receivable can't be edited.