[ADD] expand annex model

models/res_partner_contract_annex.py

@@ -12,6 +12,14 @@ class ContractOrderAnnex(models.Model):
     contract_id = fields.Many2one(
         "res.partner.contract", string="Contract", readonly=True,
     )
+    date_conclusion = fields.Date(
+        string="Conclusion Date", default=fields.Date.today(),
+    )
+    prepaid_expance = fields.Float(string="Prepaid Expance", default=0)
+    delivery_time = fields.Integer(related="order_id.delivery_time", readonly=True,)
+    payment_term = fields.Many2one(
+        "account.payment.term", related="order_id.payment_term_id", readonly=True,
+    )
 
     @api.onchange("contract_id")
     def _onchange_contract_id(self):

views/res_partner_contract_annex.xml

@@ -14,6 +14,9 @@
                             <field name="name" placeholder="Leave empty for compute"/>
                             <field name="contract_id" attrs="{'invisible': [('contract_id', '=', False)]}"/>
                             <field name="order_id"/>
+                            <field name="date_conclusion"/>
+                            <field name="payment_term"/>
+                            <field name="delivery_time"/>
                         </group>
                         <group>
                             <button name="action_print_form" type="object" string="Print" attrs="{'invisible': [('contract_id', '=', False)]}"/>