Add partner_default_properties addon with default fiscal position and payment terms for new customers

partner_default_properties/models/__init__.py

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+# -*- coding: utf-8 -*-
+from . import res_config_settings
+from . import res_partner

partner_default_properties/models/res_config_settings.py

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+# -*- coding: utf-8 -*-
+from odoo import fields, models
+
+PARAM_FISCAL_POSITION = 'partner_default_properties.fiscal_position_id'
+PARAM_PAYMENT_TERM = 'partner_default_properties.payment_term_id'
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = 'res.config.settings'
+
+    customer_fiscal_position_id = fields.Many2one(
+        comodel_name='account.fiscal.position',
+        string='Default Fiscal Position',
+        compute='_compute_customer_fiscal_position_id',
+        inverse='_set_customer_fiscal_position_id',
+    )
+    customer_payment_term_id = fields.Many2one(
+        comodel_name='account.payment.term',
+        string='Default Payment Terms',
+        compute='_compute_customer_payment_term_id',
+        inverse='_set_customer_payment_term_id',
+    )
+
+    def _compute_customer_fiscal_position_id(self):
+        ICP = self.env['ir.config_parameter'].sudo()
+        param = ICP.get_param(PARAM_FISCAL_POSITION)
+        for rec in self:
+            rec.customer_fiscal_position_id = int(param) if param else False
+
+    def _set_customer_fiscal_position_id(self):
+        ICP = self.env['ir.config_parameter'].sudo()
+        for rec in self:
+            ICP.set_param(PARAM_FISCAL_POSITION, rec.customer_fiscal_position_id.id or False)
+
+    def _compute_customer_payment_term_id(self):
+        ICP = self.env['ir.config_parameter'].sudo()
+        param = ICP.get_param(PARAM_PAYMENT_TERM)
+        for rec in self:
+            rec.customer_payment_term_id = int(param) if param else False
+
+    def _set_customer_payment_term_id(self):
+        ICP = self.env['ir.config_parameter'].sudo()
+        for rec in self:
+            ICP.set_param(PARAM_PAYMENT_TERM, rec.customer_payment_term_id.id or False)

partner_default_properties/models/res_partner.py

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+# -*- coding: utf-8 -*-
+from odoo import models
+from .res_config_settings import PARAM_FISCAL_POSITION, PARAM_PAYMENT_TERM
+
+
+class ResPartner(models.Model):
+    _inherit = 'res.partner'
+
+    def default_get(self, fields_list):
+        res = super().default_get(fields_list)
+        ICP = self.env['ir.config_parameter'].sudo()
+
+        fp_id = ICP.get_param(PARAM_FISCAL_POSITION)
+        if fp_id:
+            res['property_account_position_id'] = int(fp_id)
+
+        pt_id = ICP.get_param(PARAM_PAYMENT_TERM)
+        if pt_id:
+            res['property_payment_term_id'] = int(pt_id)
+
+        return res