añadidos tax y pos_category por defecto by category

product_category_tax/models/__init__.py

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+from . import res_company
+from . import res_config_settings
+from . import product_product
+from . import product_category

product_category_tax/models/product_category.py

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+# Copyright 2018 Eficent Business and IT Consulting Services S.L.
+#   (http://www.eficent.com)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+
+class ProductCategory(models.Model):
+    _inherit = 'product.category'
+
+    sell_tax_id = fields.Many2one(
+        comodel_name="account.tax", string="Impuesto de venta del producto",
+        help="Configura los productos de ésta categoría al impuesto definido aquí.",
+    )
+
+    buy_tax_id = fields.Many2one(
+        comodel_name="account.tax", string="Impuesto de compra del producto",
+        help="Configura los productos de ésta categoría al impuesto definido aquí.",
+    )

product_category_tax/models/product_product.py

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+# Copyright 2021 Criptomart
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+import logging
+
+from odoo import _, api, fields, models
+
+_logger = logging.getLogger(__name__)
+
+class ProductProduct(models.Model):
+    _inherit = 'product.product'
+
+
+    @api.model
+    def create(self, vals):
+        category = self.env['product.category']
+        categ_id = vals.get("categ_id")
+        template_id = vals.get("product_tmpl_id")
+        if categ_id:
+            category = category.browse(categ_id)
+            vals['taxes_id'] = category.sell_tax_id
+            vals['supplier_taxes_id'] = category.buy_tax_id
+        elif template_id:
+            template = self.env["product.template"].browse(template_id)
+            cat = template.categ_id
+            if self.env.user.company_id.use_parent_categories_to_determine_taxes:
+                while not cat.pos_categ_id and cat.parent_id:
+                    cat = cat.parent_id
+            if cat:
+                template.taxes_id = cat.sell_tax_id
+                template.supplier_taxes_id = cat.buy_tax_id
+
+        return super(ProductProduct, self).create(vals)
+
+

product_category_tax/models/res_company.py

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+# Copyright 2021 Criptomart
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class Company(models.Model):
+    _inherit = 'res.company'
+
+    use_parent_categories_to_determine_taxes = fields.Boolean(
+        string="Use parent categories to determine the taxes",
+        help="Use parent categories to determine the taxes if the category has no settings for the taxes.",
+    )

product_category_tax/models/res_config_settings.py

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+# Copyright 2021 Criptomart
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = 'res.config.settings'
+
+    use_parent_categories_to_determine_taxes = fields.Boolean(
+        related="company_id.use_parent_categories_to_determine_taxes",
+        readonly=False,
+    )