[IMP] order_id is no more creatable from annex create-form, add help message

models/res_partner_contract_annex.py

@@ -10,7 +10,12 @@ class ContractOrderAnnex(models.Model):
     _description = "Contract Annex"
 
     name = fields.Char(string="Name", help="The Number of Annex")
-    order_id = fields.Many2one("sale.order", string="Order", required=True,)
+    order_id = fields.Many2one(
+        "sale.order",
+        string="Order",
+        required=True,
+        help="Orders with this partner which are not uses in annexes yet",
+    )
     contract_id = fields.Many2one(
         "res.partner.contract", string="Contract", readonly=True,
     )

views/res_partner_contract_annex.xml

@@ -13,7 +13,7 @@
                         <group>
                             <field name="name" placeholder="Leave empty for compute"/>
                             <field name="contract_id" attrs="{'invisible': [('contract_id', '=', False)]}"/>
-                            <field name="order_id"/>
+                            <field name="order_id" options="{'no_create': True}"/>
                             <field name="date_conclusion"/>
                             <field name="payment_term" invisible="1"/>
                             <field name="delivery_time" invisible="1"/>