diff --git a/addons/purchase_requisition/models/purchase.py b/addons/purchase_requisition/models/purchase.py
index 6ba14e2f65b..7c7e2e6f1dd 100644
--- a/addons/purchase_requisition/models/purchase.py
+++ b/addons/purchase_requisition/models/purchase.py
@@ -15,6 +15,7 @@ class PurchaseOrder(models.Model):
         if not self.requisition_id:
             return
 
+        self = self.with_company(self.company_id)
         requisition = self.requisition_id
         if self.partner_id:
             partner = self.partner_id
diff --git a/addons/purchase_requisition/models/purchase_requisition.py b/addons/purchase_requisition/models/purchase_requisition.py
index 92b789c090f..431180d737f 100644
--- a/addons/purchase_requisition/models/purchase_requisition.py
+++ b/addons/purchase_requisition/models/purchase_requisition.py
@@ -75,6 +75,7 @@ class PurchaseRequisition(models.Model):
 
     @api.onchange('vendor_id')
     def _onchange_vendor(self):
+        self = self.with_company(self.company_id)
         if not self.vendor_id:
             self.currency_id = self.env.company.currency_id.id
         else:
@@ -84,6 +85,7 @@ class PurchaseRequisition(models.Model):
             ('vendor_id', '=', self.vendor_id.id),
             ('state', '=', 'ongoing'),
             ('type_id.quantity_copy', '=', 'none'),
+            ('company_id', '=', self.company_id),
         ])
         if any(requisitions):
             title = _("Warning for %s") % self.vendor_id.name
diff --git a/addons/purchase_stock/models/account_invoice.py b/addons/purchase_stock/models/account_invoice.py
index 1d9d9c72788..18eb4d96935 100644
--- a/addons/purchase_stock/models/account_invoice.py
+++ b/addons/purchase_stock/models/account_invoice.py
@@ -40,6 +40,7 @@ class AccountMove(models.Model):
             if move.move_type not in ('in_invoice', 'in_refund', 'in_receipt') or not move.company_id.anglo_saxon_accounting:
                 continue
 
+            move = move.with_company(move.company_id)
             for line in move.invoice_line_ids.filtered(lambda line: line.product_id.type == 'product' and line.product_id.valuation == 'real_time'):
 
                 # Filter out lines being not eligible for price difference.
diff --git a/addons/purchase_stock/models/purchase.py b/addons/purchase_stock/models/purchase.py
index 6608b629f24..a3db07965a6 100644
--- a/addons/purchase_stock/models/purchase.py
+++ b/addons/purchase_stock/models/purchase.py
@@ -187,7 +187,6 @@ class PurchaseOrder(models.Model):
             picking_type = self.env['stock.picking.type'].search([('code', '=', 'incoming'), ('warehouse_id', '=', False)])
         return picking_type[:1]
 
-    @api.model
     def _prepare_picking(self):
         if not self.group_id:
             self.group_id = self.group_id.create({
@@ -210,6 +209,7 @@ class PurchaseOrder(models.Model):
     def _create_picking(self):
         StockPicking = self.env['stock.picking']
         for order in self:
+            order = order.with_company(order.company_id)
             if any([ptype in ['product', 'consu'] for ptype in order.order_line.mapped('product_id.type')]):
                 pickings = order.picking_ids.filtered(lambda x: x.state not in ('done', 'cancel'))
                 if not pickings: