Add StockChanges index

app/helpers/stock_changes_helper.rb

@@ -0,0 +1,13 @@
+module StockChangesHelper
+
+  def link_to_stock_change_reason(stock_change)
+    if stock_change.delivery_id
+      t '.delivery'
+    elsif stock_change.order_id
+      t '.order'
+    elsif stock_change.stock_taking_id
+      t '.stock_taking'
+    end
+  end
+
+end