First Commit

om_account_accountant/models/__init__.py

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+from . import account_move
+from . import settings

om_account_accountant/models/account_move.py

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+from odoo import fields, models, api
+
+
+class AccountMove(models.Model):
+    _inherit = "account.move"
+
+    @api.model
+    def _get_invoice_in_payment_state(self):
+        return 'in_payment'

om_account_accountant/models/settings.py

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+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = "res.config.settings"
+
+    anglo_saxon_accounting = fields.Boolean(
+        related="company_id.anglo_saxon_accounting",
+        readonly=False, string="Use anglo-saxon accounting",
+        help="Record the cost of a good as an expense when this good is invoiced to a final customer."
+    )