[FIX] stock_account: open layer form from list

Since e4988b70, the record openned from the stock valuation layer
list view will depend on the stock move parent's document. If, the move
has a picking_id set, the record will be the stock picking.

This implies in some cases (a stock move linked to a picking or a
manufacturing order) we cannot access the stock valuation form view and
thus the accounting entries are not reachable from there.

This commit adds a button in the list view to open the layer form view.

closes odoo/odoo#105452

Signed-off-by: Arnold Moyaux (arm) <arm@odoo.com>

addons/stock_account/models/stock_valuation_layer.py

@@ -68,6 +68,15 @@ class StockValuationLayer(models.Model):
             fields.remove('unit_cost')
         return super().read_group(domain, fields, groupby, offset, limit, orderby, lazy)
 
+    def action_open_layer(self):
+        self.ensure_one()
+        return {
+            'res_model': self._name,
+            'type': 'ir.actions.act_window',
+            'views': [[False, "form"]],
+            'res_id': self.id,
+        }
+
     def action_open_reference(self):
         self.ensure_one()
         if self.stock_move_id:

addons/stock_account/views/stock_valuation_layer_views.xml

@@ -46,6 +46,7 @@
                   action="action_open_reference" type="object">
                 <field name="create_date" string="Date" />
                 <field name="reference"/>
+                <button name="action_open_layer" icon="fa-arrow-right" title="Open Valuation Layer" type="object"/>
                 <field name="product_id" />
                 <field name="company_id" groups="base.group_multi_company"/>
                 <field name="quantity" string="Moved Quantity"/>