Hello,

Open account/account_invoice_view.xml and replace code :

<tree string="Invoice Lines" editable="bottom">

to

<tree string="Invoice Lines">

Then update the account module as you have made change in xml Like :

-u account -d dbname (This is for ubuntu OS)

You can also made same change by starting debug mode -> and then open a form view -> Edit Form View. Change code and save it. (This is not permanent change)

Thank You.