Steps to regenerate
1.) Create an Order from Order Entry
2.) Apply any promo
3.) Now as promo is applied, it is shown in the applied promo list below
4.) The UiLabel for the promo is EcommerceGeneratedDescription
The ftl (applications/order/template/entry/cart/promotiondetails.ftl) used for showing the promotion detail is common for ecommerce and order entry.
Moved the UiLable EcommerceGeneratedDescription to the OrderUiLabels
Since OrderUiLabels are included in the E-Commerce main-decorator
Please refer attached screenshot show_promo_detail.png for more details.