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

rma_purchase/models/rma_order_line.py

@@ -44,6 +44,11 @@ class RmaOrderLine(models.Model):
         ondelete='restrict',
         readonly=True, states={'draft': [('readonly', False)]},
     )
+    purchase_id = fields.Many2one(
+        string="Source Purchase Order",
+        related='purchase_order_line_id.order_id',
+        readonly=True,
+    )
     purchase_order_line_ids = fields.Many2many(
         comodel_name='purchase.order.line',
         relation='purchase_line_rma_line_rel',

rma_purchase/views/rma_order_line_view.xml

@@ -27,6 +27,10 @@
                     <field name="qty_purchased"/>
                 </group>
             </group>
+            <field name="origin" position="after">
+                <field name="purchase_id"
+                       attrs="{'invisible': [('purchase_order_line_id', '=', False)]}"/>
+            </field>
             <notebook position="inside">
                 <page name="purchase" string="Purchase Lines">
                     <field name="purchase_order_line_ids" nolabel="1"/>