How do I add a new field "Unit" to view invoice_lines

Question

For the view when creating an invoice in the app "Invoicing" in Odoo 15, a new field "Unit" should be added to the "Invoice Lines" after the field "Quantity".
The field is supposed to be freely writable for each new line in the invoice lines and allowed to contain a text about the unit (e.g. Quantity: 34, Unit: "Hours") Unfortunately, I seem to address it incorrectly via my add on or miss something. I don't understand the error message during the installation, because exactly this field, where i

Michael Holthausen · Answer

Oh, thanks! The field is shown now in the view. But somehow the typed value isn't saved in the first try. Only if the invoice was created as a draft and you go into editing mode again, a value will be permanently saved there. For the other fields, the values are already permanently saved after the first creation of the invoice.

Edit:

Found out, that I nedded to add the field also into "line_ids" field, so i have two xpath- expressions now:

*Edit:*
Found out, that I nedded to add the field also into "line_ids" field, so i have two xpath- expressions now:

Mily Shajan · Answer

Hi
Add the field unit_field in account.move.line. In the view field is added inside the invoice_line_ids which is a on2many field that links account.move.line [1]
Try to add the field like this and install the module
class Unit(models.Model):
_inherit = ' account.move.line' [2]
unit_field = fields.Char('Unit')
Regards

[1] https://account.move.line
[2] https://account.move.line'

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