[FIX] in v10, we can add value to selection fieldw

pos_price_to_weight/data/barcode_rule.xml

@@ -9,7 +9,7 @@ License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
     <record id="rule_price_to_weight" model="barcode.rule">
         <field name="name">Price Barcodes (Computed Weight) 2 Decimals</field>
-            <field name="barcode_nomenclature_id" ref="barcodes.default_barcode_nomenclature"/>
+        <field name="barcode_nomenclature_id" ref="barcodes.default_barcode_nomenclature"/>
         <field name="type">price_to_weight</field>
         <field name="pattern">02.....{NNNDD}</field>
         <field name="sequence">15</field>

pos_price_to_weight/models/barcode_rule.py

@@ -3,15 +3,12 @@
 # @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
-from odoo import _, api, models
+from odoo import _, fields, models
 
 
 class BarcodeRule(models.Model):
     _inherit = 'barcode.rule'
 
-    @api.model
-    def _get_type_selection(self):
-        res = super(BarcodeRule, self)._get_type_selection()
-        res.append(
-            ('price_to_weight', _('Priced Product (Computed Weight)')))
-        return res
+    type = fields.Selection(selection_add=[
+        ('price_to_weight', _('Priced Product (Computed Weight)'))
+    ])