[FIX] sale: SO name

In v8, the field "Order Reference" was part of the "Import-Compatible
Export" fields. This is not the case anymore in v9 since the field is
always read-only.

The fix uses the same logic than v8: dedine the field as non-readonly
for state "Draft" in the model, but always set it to readonly in the
view.

opw-676095

addons/sale/sale.py

@@ -98,7 +98,7 @@ class SaleOrder(models.Model):
         for order in self:
             order.order_line._compute_tax_id()
 
-    name = fields.Char(string='Order Reference', required=True, copy=False, readonly=True, index=True, default=lambda self: _('New'))
+    name = fields.Char(string='Order Reference', required=True, copy=False, readonly=True, states={'draft': [('readonly', False)]}, index=True, default=lambda self: _('New'))
     origin = fields.Char(string='Source Document', help="Reference of the document that generated this sales order request.")
     client_order_ref = fields.Char(string='Customer Reference', copy=False)