diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index 9f004fc..3cb488c 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -218,8 +218,8 @@ class Sale(metaclass=PoolMeta):
     __name__ = 'sale.sale'
 
     btb = fields.Many2One('back.to.back',"Back to back")
-    from_location = fields.Many2One('stock.location', 'From location',domain=[('type', "!=", 'customer')])
-    to_location = fields.Many2One('stock.location', 'To location',domain=[('type', "!=", 'supplier')])
+    from_location = fields.Many2One('stock.location', 'From location', required=True,domain=[('type', "!=", 'customer')])
+    to_location = fields.Many2One('stock.location', 'To location', required=True,domain=[('type', "!=", 'supplier')])
     shipment_out = fields.Many2One('stock.shipment.out','Sales')
     #pnl = fields.One2Many('valuation.valuation', 'sale', 'Pnl')
     pnl = fields.One2Many('valuation.valuation.dyn', 'r_sale', 'Pnl',states={'invisible': ~Eval('group_pnl'),})
@@ -229,13 +229,13 @@ class Sale(metaclass=PoolMeta):
     #plans = fields.One2Many('workflow.plan','sale',"Execution plans")
     forex = fields.One2Many('forex.cover.physical.sale','contract',"Forex",readonly=True)
     broker = fields.Many2One('party.party',"Broker",domain=[('categories.parent', 'child_of', [4])])
-    tol_min = fields.Numeric("Tol - in %")
-    tol_max = fields.Numeric("Tol + in %")
+    tol_min = fields.Numeric("Tol - in %", required=True)
+    tol_max = fields.Numeric("Tol + in %", required=True)
     tol_min_qt = fields.Numeric("Tol -")
     tol_max_qt = fields.Numeric("Tol +")
-    certif = fields.Many2One('purchase.certification',"Certification",states={'invisible': Eval('company_visible'),})
-    wb = fields.Many2One('purchase.weight.basis',"Weight basis")
-    association = fields.Many2One('purchase.association',"Association",states={'invisible': Eval('company_visible'),})
+    certif = fields.Many2One('purchase.certification',"Certification", required=True,states={'invisible': Eval('company_visible'),})
+    wb = fields.Many2One('purchase.weight.basis',"Weight basis", required=True)
+    association = fields.Many2One('purchase.association',"Association", required=True,states={'invisible': Eval('company_visible'),})
     crop = fields.Many2One('purchase.crop',"Crop",states={'invisible': Eval('company_visible'),})
     viewer = fields.Function(fields.Text(""),'get_viewer')
     doc_template = fields.Many2One('doc.template',"Template")