diff --git a/modules/purchase/purchase.py b/modules/purchase/purchase.py
index a828a2b..420423a 100755
--- a/modules/purchase/purchase.py
+++ b/modules/purchase/purchase.py
@@ -89,14 +89,14 @@ class Purchase(
     number = fields.Char("Number", readonly=True)
     reference = fields.Char("Reference")
     description = fields.Char('Description', size=None, states=_states)
-    purchase_date = fields.Date('Purchase Date',
+    purchase_date = fields.Date('Purchase Date', required=True,
         states={
             'readonly': ~Eval('state').in_(['draft', 'quotation']),
             'required': ~Eval('state').in_(
                 ['draft', 'quotation', 'cancelled']),
             })
     payment_term = fields.Many2One(
-        'account.invoice.payment_term', "Payment Term", ondelete='RESTRICT',
+        'account.invoice.payment_term', "Payment Term", required=True, ondelete='RESTRICT',
         states={
             'readonly': ~Eval('state').in_(['draft', 'quotation']),
             })
@@ -389,6 +389,11 @@ class Purchase(
     def default_state():
         return 'draft'
 
+    @classmethod
+    def default_purchase_date(cls):
+        Date = Pool().get('ir.date')
+        return Date.today()
+    
     @classmethod
     def default_currency(cls, **pattern):
         pool = Pool()
diff --git a/modules/purchase_trade/purchase.py b/modules/purchase_trade/purchase.py
index 18f2510..9bff4d1 100755
--- a/modules/purchase_trade/purchase.py
+++ b/modules/purchase_trade/purchase.py
@@ -254,17 +254,17 @@ class Purchase(metaclass=PoolMeta):
     __name__ = 'purchase.purchase'
 
     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_in = fields.Many2One('stock.shipment.in','Purchases')
     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'),})
     pnl = fields.One2Many('valuation.valuation.dyn', 'r_purchase', 'Pnl',states={'invisible': ~Eval('group_pnl'),})
     pnl_ = fields.One2Many('valuation.valuation.line', 'purchase', 'Pnl',states={'invisible': Eval('group_pnl'),}) 
@@ -293,6 +293,35 @@ class Purchase(metaclass=PoolMeta):
     def get_company_info(self,name):
         return (self.company.party.name == 'MELYA')
 
+    @classmethod
+    def default_wb(cls):
+        WB = Pool().get('purchase.weight.basis')
+        wb = WB.search(['id','>',0])
+        if wb:
+            return wb[0]
+        
+    @classmethod
+    def default_certif(cls):
+        Certification = Pool().get('purchase.certification')
+        certification = Certification.search(['id','>',0])
+        if certification:
+            return certification[0]
+        
+    @classmethod
+    def default_certif(cls):
+        Association = Pool().get('purchase.association')
+        association = Association.search(['id','>',0])
+        if association:
+            return association[0]
+    
+    @classmethod
+    def default_tol_min(cls):
+        return 0
+    
+    @classmethod
+    def default_tol_max(cls):
+        return 0
+
     @property
     def report_terms(self):
         if self.lines: