[9.0][IMP] rma: add link to source SO and PO

rma_sale/models/rma_order_line.py

@@ -41,6 +41,10 @@ class RmaOrderLine(models.Model):
         ondelete='restrict', copy=False,
         readonly=True, states={'draft': [('readonly', False)]},
     )
+    sale_id = fields.Many2one(
+        string="Source Sales Order", related='sale_line_id.order_id',
+        readonly=True,
+    )
     sale_line_ids = fields.One2many(
         comodel_name='sale.order.line', inverse_name='rma_line_id',
         string='Sales Order Lines', readonly=True,

rma_sale/views/rma_order_line_view.xml

@@ -32,6 +32,10 @@
                 <field name="delivery_policy" position="after">
                     <field name="sale_type"/>
                 </field>
+                <field name="origin" position="after">
+                    <field name="sale_id"
+                           attrs="{'invisible': [('sale_line_id', '=', False)]}"/>
+                </field>
                 <notebook position="inside">
                     <page name="sale" string="Sale Lines">
                         <field name="sale_line_ids" nolabel="1"/>