diff --git a/db/migrate/20170403161857_create_sale_items.rb b/db/migrate/20170403161857_create_sale_items.rb
index 14882cbc..66a32f14 100755
--- a/db/migrate/20170403161857_create_sale_items.rb
+++ b/db/migrate/20170403161857_create_sale_items.rb
@@ -6,7 +6,7 @@ class CreateSaleItems < ActiveRecord::Migration[5.1]
       t.string :product_code, :null => false
       t.string :item_instance_code
       t.string :product_name, :null => false
-      t.string :product_alt_name, :null => false
+      t.string :product_alt_name
       t.integer :account_id, :index => true, :limit => 8, :null => false, :default => 1
       t.string :status, :index => true
       t.string :remark, :index => true