diff --git a/beesdoo_purchase/__init__.py b/beesdoo_purchase/__init__.py
index 9a7e03e..0650744 100644
--- a/beesdoo_purchase/__init__.py
+++ b/beesdoo_purchase/__init__.py
@@ -1 +1 @@
-from . import models
\ No newline at end of file
+from . import models
diff --git a/beesdoo_purchase/__manifest__.py b/beesdoo_purchase/__manifest__.py
index 686afc6..938e3c1 100644
--- a/beesdoo_purchase/__manifest__.py
+++ b/beesdoo_purchase/__manifest__.py
@@ -1,25 +1,25 @@
 {
-    'name': "Bees Purchase",
-
-    'summary': """
-        Extension du module Purchase""",
-
-    'description': """
-        Long description of module's purpose
+    "name": "Bees Purchase",
+    "summary": """
+        Extends Purchase module. 
+        """,
+    "description": """
+        Extends Purchase module: 
+        - Adds a 'Responsible' field to purchase orders:
+        This is a user who will follow up the order. This users replaces 
+        the creator in the order's mail messages followers list, and in the 
+        create_uid ORM field. His user's contact info is printed on 
+        purchases orders as 'Referent'.
+        - A filter w.r.t. the mail sellers is placed on the products field of a 
+        purchase order.  
     """,
-
-    'author': "Beescoop - Cellule IT, "
-              "Coop IT Easy SCRLfs",
-    'website': "https://github.com/beescoop/Obeesdoo",
-
-    'category': 'Purchase',
-    'version': '12.0.1.1.0',
-
-    'depends': ['base', 'purchase', 'beesdoo_product'],
-
-    'data': [
-        'views/purchase_order.xml',
-        'security/ir.model.access.csv',
-        'report/report_purchaseorder.xml',
+    "author": "Beescoop - Cellule IT, " "Coop IT Easy SCRLfs",
+    "website": "https://github.com/beescoop/Obeesdoo",
+    "category": "Purchase",
+    "version": "12.0.1.1.0",
+    "depends": ["base", "purchase", "beesdoo_product"],
+    "data": [
+        "views/purchase_order.xml",
+        "report/report_purchaseorder.xml",
     ],
 }
diff --git a/beesdoo_purchase/models/__init__.py b/beesdoo_purchase/models/__init__.py
index cacb10c..370f577 100644
--- a/beesdoo_purchase/models/__init__.py
+++ b/beesdoo_purchase/models/__init__.py
@@ -1 +1 @@
-from . import purchase, purchase_order
+from . import purchase
diff --git a/beesdoo_purchase/models/purchase.py b/beesdoo_purchase/models/purchase.py
index fe069e5..554e4b6 100644
--- a/beesdoo_purchase/models/purchase.py
+++ b/beesdoo_purchase/models/purchase.py
@@ -1,5 +1,6 @@
 from odoo import api, fields, models
 
+
 class PurchaseOrder(models.Model):
     _inherit = "purchase.order"
 
@@ -7,17 +8,16 @@ class PurchaseOrder(models.Model):
     # create_uid is a magic field that belongs to the ORM that is not
     # editable via a form.
     create_uid = fields.Many2one(
-        comodel_name='res.users',
-        compute='_compute_create_uid',
+        comodel_name="res.users", compute="_compute_create_uid"
     )
     supervisor_id = fields.Many2one(
-        comodel_name='res.users',
-        string='Responsible',
+        comodel_name="res.users",
+        string="Responsible",
         required=True,
         default=lambda self: self.env.user,
     )
 
-    @api.depends('supervisor_id')
+    @api.depends("supervisor_id")
     def _compute_create_uid(self):
         for rec in self:
             if rec.supervisor_id:
@@ -25,14 +25,17 @@ class PurchaseOrder(models.Model):
 
     @api.multi
     def write(self, vals):
-        if 'supervisor_id' in vals:
-            new_supervisor = vals['supervisor_id']
+        if "supervisor_id" in vals:
+            new_partner = (
+                self.env["res.users"]
+                .browse(vals["supervisor_id"])
+                .partner_id.id
+            )
             for rec in self:
-                rec.message_unsubscribe_users(
-                    user_ids=rec.supervisor_id.ids,
+                rec.message_unsubscribe(
+                    partner_ids=rec.supervisor_id.partner_id.ids
                 )
-                rec.message_subscribe_users(
-                    user_ids=[new_supervisor],
-                    subtype_ids=[],
+                rec.message_subscribe(
+                    partner_ids=[new_partner], subtype_ids=[]
                 )
         return super(PurchaseOrder, self).write(vals)
diff --git a/beesdoo_purchase/models/purchase_order.py b/beesdoo_purchase/models/purchase_order.py
deleted file mode 100644
index c572f8b..0000000
--- a/beesdoo_purchase/models/purchase_order.py
+++ /dev/null
@@ -1,9 +0,0 @@
-from odoo import models, fields, api
-
-class PurchaseOrder(models.Model):
-
-    _inherit = 'purchase.order'
-    
-class PurchaseOrderLine(models.Model):
-    
-    _inherit = 'purchase.order.line'
diff --git a/beesdoo_purchase/report/report_purchaseorder.xml b/beesdoo_purchase/report/report_purchaseorder.xml
index 99d4b67..7a4cf5d 100644
--- a/beesdoo_purchase/report/report_purchaseorder.xml
+++ b/beesdoo_purchase/report/report_purchaseorder.xml
@@ -7,7 +7,7 @@
             <div t-if="o.create_uid.name" class="col-xs-3">
                 <strong>Your Referent:</strong>
                 <div t-field="o.create_uid"
-                t-field-options='{"widget": "contact", "fields": ["name", "phone", "mobile"], "no_marker": true, "phone_icons": true}'/>
+                t-options='{"widget": "contact", "fields": ["name", "phone", "mobile"], "no_marker": true, "phone_icons": true}'/>
             </div>
 
         </div>
diff --git a/beesdoo_purchase/security/ir.model.access.csv b/beesdoo_purchase/security/ir.model.access.csv
deleted file mode 100644
index 58262d4..0000000
--- a/beesdoo_purchase/security/ir.model.access.csv
+++ /dev/null
@@ -1 +0,0 @@
-id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
\ No newline at end of file