diff --git a/mrp_bom_attribute_match/models/mrp_bom.py b/mrp_bom_attribute_match/models/mrp_bom.py
index 02f94af05..21569326a 100644
--- a/mrp_bom_attribute_match/models/mrp_bom.py
+++ b/mrp_bom_attribute_match/models/mrp_bom.py
@@ -39,11 +39,11 @@ class MrpBomLine(models.Model):
 
     @api.onchange("component_template_id")
     def _onchange_component_template_id(self):
-        self.update_component_attributes()
+        self._update_component_attributes()
 
-    def update_component_attributes(self):
+    def _update_component_attributes(self):
         if self.component_template_id:
-            self.check_component_attributes()
+            self._check_component_attributes()
             self.product_backup_id = self.product_id.id
             self.match_on_attribute_ids = (
                 self.component_template_id.attribute_line_ids.mapped("attribute_id")
@@ -51,14 +51,14 @@ class MrpBomLine(models.Model):
                 .ids
             )
             self.product_id = False
-            self.check_variants_validity()
+            self._check_variants_validity()
         else:
             self.match_on_attribute_ids = False
             if self.product_backup_id and not self.product_id:
                 self.product_id = self.product_backup_id.id
                 self.product_backup_id = False
 
-    def check_component_attributes(self):
+    def _check_component_attributes(self):
         comp_attr_ids = (
             self.component_template_id.valid_product_template_attribute_line_ids.attribute_id.ids
         )
@@ -84,9 +84,9 @@ class MrpBomLine(models.Model):
     @api.onchange("bom_product_template_attribute_value_ids")
     def _onchange_attribute_value_ids(self):
         if self.bom_product_template_attribute_value_ids:
-            self.check_variants_validity()
+            self._check_variants_validity()
 
-    def check_variants_validity(self):
+    def _check_variants_validity(self):
         if (
             not self.bom_product_template_attribute_value_ids
             or not self.component_template_id
@@ -195,7 +195,7 @@ class MrpBom(models.Model):
                 update_product_boms()
                 product_ids.clear()
             # upd start
-            component_template_product = self.get_component_template_product(
+            component_template_product = self._get_component_template_product(
                 current_line, product, current_line.product_id
             )
             if component_template_product:
@@ -271,7 +271,9 @@ class MrpBom(models.Model):
                 )
         return boms_done, lines_done
 
-    def get_component_template_product(self, bom_line, bom_product_id, line_product_id):
+    def _get_component_template_product(
+        self, bom_line, bom_product_id, line_product_id
+    ):
         if bom_line.component_template_id:
             comp = bom_line.component_template_id
             comp_attr_ids = (
@@ -313,5 +315,5 @@ class MrpBom(models.Model):
     def write(self, vals):
         res = super(MrpBom, self).write(vals)
         for line in self.bom_line_ids:
-            line.update_component_attributes()
+            line._update_component_attributes()
         return res
diff --git a/mrp_bom_attribute_match/models/mrp_production.py b/mrp_bom_attribute_match/models/mrp_production.py
index b276a491a..ed2467915 100644
--- a/mrp_bom_attribute_match/models/mrp_production.py
+++ b/mrp_bom_attribute_match/models/mrp_production.py
@@ -5,15 +5,14 @@ class MrpProduction(models.Model):
     _inherit = "mrp.production"
 
     def action_confirm(self):
-        res = super(MrpProduction, self).action_confirm()
-        if self and self.bom_id:
-            for bom_line in self.bom_id.bom_line_ids:
-                if bom_line.component_template_id:
-                    # product_id was set in mrp.bom.explode for correct flow. Need to remove it.
-                    bom_line.product_id = False
+        res = super().action_confirm()
+        for bom_line in self.bom_id.bom_line_ids:
+            if bom_line.component_template_id:
+                # product_id was set in mrp.bom.explode for correct flow. Need to remove it.
+                bom_line.product_id = False
         return res
 
     def write(self, vals):
-        for bl in self.bom_id.bom_line_ids.filtered(lambda x: x.component_template_id):
-            bl.check_component_attributes()
-        return super(MrpProduction, self).write(vals)
+        for bl in self.bom_id.bom_line_ids.filtered("component_template_id"):
+            bl._check_component_attributes()
+        return super().write(vals)
diff --git a/mrp_bom_attribute_match/models/product.py b/mrp_bom_attribute_match/models/product.py
index ec4a9062d..d2e238a4f 100644
--- a/mrp_bom_attribute_match/models/product.py
+++ b/mrp_bom_attribute_match/models/product.py
@@ -8,11 +8,11 @@ class ProductTemplate(models.Model):
     def write(self, vals):
         res = super().write(vals)
         for rec in self:
-            rec.check_product_with_component_change_allowed()
-            rec.check_component_change_allowed()
+            rec._check_product_with_component_change_allowed()
+            rec._check_component_change_allowed()
         return res
 
-    def check_product_with_component_change_allowed(self):
+    def _check_product_with_component_change_allowed(self):
         self.ensure_one()
         if len(self.attribute_line_ids) > 0 and len(self.bom_ids) > 0:
             for bom in self.bom_ids:
@@ -38,10 +38,10 @@ class ProductTemplate(models.Model):
                             )
                         )
 
-    def check_component_change_allowed(self):
+    def _check_component_change_allowed(self):
         self.ensure_one()
         if len(self.attribute_line_ids) > 0:
-            boms = self.get_component_boms()
+            boms = self._get_component_boms()
             if boms:
                 for bom in boms:
                     vpa = bom.product_tmpl_id.valid_product_template_attribute_line_ids
@@ -61,7 +61,7 @@ class ProductTemplate(models.Model):
                             )
                         )
 
-    def get_component_boms(self):
+    def _get_component_boms(self):
         self.ensure_one()
         bom_lines = self.env["mrp.bom.line"].search(
             [("component_template_id", "=", self._origin.id)]