diff --git a/addons/account/models/account.py b/addons/account/models/account.py
index 8cb2167f02c..91a95ba359d 100644
--- a/addons/account/models/account.py
+++ b/addons/account/models/account.py
@@ -232,7 +232,7 @@ class AccountJournal(models.Model):
 
     #groups_id = fields.Many2many('res.groups', 'account_journal_group_rel', 'journal_id', 'group_id', string='Groups')
     currency_id = fields.Many2one('res.currency', help='The currency used to enter statement', string="Currency", oldname='currency')
-    company_id = fields.Many2one('res.company', string='Company', required=True, index=1, default=lambda self: self.env.user.company_id,
+    company_id = fields.Many2one('res.company', string='Company', required=True, index=True, default=lambda self: self.env.user.company_id,
         help="Company related to this journal")
 
     refund_sequence = fields.Boolean(string='Dedicated Refund Sequence', help="Check this box if you don't want to share the same sequence for invoices and refunds made from this journal", default=False)
diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index bb115c10cbf..0a901c947b0 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -133,7 +133,7 @@ class PurchaseOrder(models.Model):
     picking_count = fields.Integer(compute='_compute_picking', string='Receptions', default=0)
     picking_ids = fields.Many2many('stock.picking', compute='_compute_picking', string='Receptions', copy=False)
 
-    date_planned = fields.Datetime(string='Scheduled Date', compute='_compute_date_planned', inverse='_inverse_date_planned', required=True, select=True, oldname='minimum_planned_date')
+    date_planned = fields.Datetime(string='Scheduled Date', compute='_compute_date_planned', inverse='_inverse_date_planned', required=True, index=True, oldname='minimum_planned_date')
 
     amount_untaxed = fields.Monetary(string='Untaxed Amount', store=True, readonly=True, compute='_amount_all', track_visibility='always')
     amount_tax = fields.Monetary(string='Taxes', store=True, readonly=True, compute='_amount_all')
@@ -145,7 +145,7 @@ class PurchaseOrder(models.Model):
 
     product_id = fields.Many2one('product.product', related='order_line.product_id', string='Product')
     create_uid = fields.Many2one('res.users', 'Responsible')
-    company_id = fields.Many2one('res.company', 'Company', required=True, select=1, states=READONLY_STATES, default=lambda self: self.env.user.company_id.id)
+    company_id = fields.Many2one('res.company', 'Company', required=True, index=True, states=READONLY_STATES, default=lambda self: self.env.user.company_id.id)
 
     picking_type_id = fields.Many2one('stock.picking.type', 'Deliver To', states=READONLY_STATES, required=True, default=_default_picking_type,\
         help="This will determine picking type of incoming shipment")
@@ -518,7 +518,7 @@ class PurchaseOrderLine(models.Model):
 
     name = fields.Text(string='Description', required=True)
     product_qty = fields.Float(string='Quantity', digits=dp.get_precision('Product Unit of Measure'), required=True)
-    date_planned = fields.Datetime(string='Scheduled Date', required=True, select=True)
+    date_planned = fields.Datetime(string='Scheduled Date', required=True, index=True)
     taxes_id = fields.Many2many('account.tax', string='Taxes', domain=['|', ('active', '=', False), ('active', '=', True)])
     product_uom = fields.Many2one('product.uom', string='Product Unit of Measure', required=True)
     product_id = fields.Many2one('product.product', string='Product', domain=[('purchase_ok', '=', True)], change_default=True, required=True)
@@ -529,7 +529,7 @@ class PurchaseOrderLine(models.Model):
     price_total = fields.Monetary(compute='_compute_amount', string='Total', store=True)
     price_tax = fields.Monetary(compute='_compute_amount', string='Tax', store=True)
 
-    order_id = fields.Many2one('purchase.order', string='Order Reference', select=True, required=True, ondelete='cascade')
+    order_id = fields.Many2one('purchase.order', string='Order Reference', index=True, required=True, ondelete='cascade')
     account_analytic_id = fields.Many2one('account.analytic.account', string='Analytic Account', domain=[('account_type', '=', 'normal')])
     company_id = fields.Many2one('res.company', related='order_id.company_id', string='Company', store=True, readonly=True)
     state = fields.Selection(related='order_id.state', stored=True)