diff --git a/modules/purchase_trade/lot.py b/modules/purchase_trade/lot.py
index ac12a41..d690810 100755
--- a/modules/purchase_trade/lot.py
+++ b/modules/purchase_trade/lot.py
@@ -3226,28 +3226,29 @@ class ContractDetail(ModelView):
 
     category = fields.Integer("Category")
     cd = fields.Many2One('contracts.start',"Contracts")
-    party = fields.Many2One('party.party',"Party",domain=[('categories.parent', 'child_of', Eval('category'))],depends=['category'])
-    currency = fields.Many2One('currency.currency',"Currency")
-    incoterm = fields.Many2One('incoterm.incoterm',"Incoterm")
-    quantity = fields.Numeric("Quantity",digits=(1,5))
-    unit = fields.Many2One('product.uom',"Unit")
+    party = fields.Many2One('party.party',"Party", required=True,domain=[('categories.parent', 'child_of', Eval('category'))],depends=['category'])
+    currency = fields.Many2One('currency.currency',"Currency", required=True)
+    incoterm = fields.Many2One('incoterm.incoterm',"Incoterm", required=True)
+    quantity = fields.Numeric("Quantity",digits=(1,5), required=True)
+    unit = fields.Many2One('product.uom',"Unit", required=True)
     qt_unit = fields.Many2One('product.uom',"Unit")
-    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)
     crop = fields.Many2One('purchase.crop',"Crop")
     del_period = fields.Many2One('product.month',"Delivery Period")
     from_del = fields.Date("From")
     to_del = fields.Date("To")
-    price = fields.Numeric("Price",digits=(1,4),states={'invisible': Eval('price_type') != 'priced'})
+    price = fields.Numeric("Price", required=True,digits=(1,4),states={'invisible': Eval('price_type') != 'priced'})
     price_type = price_type = fields.Selection([
         ('cash', 'Cash Price'),
         ('priced', 'Priced'),
         ('basis', 'Basis'),
-    ], 'Price type')
+    ], 'Price type', required=True)
     currency_unit = fields.Selection('get_currency_unit',string="Curr/Unit")
     reference = fields.Char("Reference")
     from_location = fields.Many2One('stock.location',"From location")
     to_location = fields.Many2One('stock.location',"To location")
+    payment_term = fields.Many2One('account.invoice.payment_term',"Payment Term", required=True)
 
     @classmethod
     def default_category(cls):
diff --git a/modules/purchase_trade/service.py b/modules/purchase_trade/service.py
index 927fa8d..2d9f929 100644
--- a/modules/purchase_trade/service.py
+++ b/modules/purchase_trade/service.py
@@ -53,6 +53,7 @@ class ContractFactory:
             contract.crop = c.crop
             contract.tol_min = c.tol_min
             contract.tol_max = c.tol_max
+            contract.payment_term = c.payment_term
             contract.reference = c.reference
             contract.from_location = c.from_location
             contract.to_location = c.to_location
diff --git a/modules/purchase_trade/view/contract_detail_tree.xml b/modules/purchase_trade/view/contract_detail_tree.xml
index af70bb1..6def8fc 100755
--- a/modules/purchase_trade/view/contract_detail_tree.xml
+++ b/modules/purchase_trade/view/contract_detail_tree.xml
@@ -9,6 +9,7 @@
    <field name="tol_min"/>
    <field name="tol_max"/>
    <field name="price_type"/>
+   <field name="payment_term"/>
    <field name="incoterm"/>
    <field name="crop"/>
    <field name="del_period"/>