AbleCommerce Shopping Cart Software

It doesn't show in Shopping Cart Summary page and checkout pages. Only regular price showed.
What may be the problem?

Thanks a lot!

Just to clarify,

The field for MSRP has been modified on our end to show as a sale price for the user. The sale price shows on product categories and product details pages, but after you add it to the cart, it only shows the regular price in the shopping cart summary & checkout. The sale price tag does not follow into the cart.

What could be causing this problem?

Where are you putting the sale price on your product edit page? If that is put into the MSRP, it doesn't have anything to do with the real price of the product. The product price that will go into the basket and go thru checkout is the price in the product price of the product edit page, unless you are giving a discount and I can't remember if it even changes then or if the discounts are still shown separately.

Well we have modified the system a bit to make the MSRP box into a Sale Price box. On the front end, this will strikethrough the regular price, and put a sale price in red below it.

This information needs to carry through to the end of checkout and into the backend.

I put the sale price in the field called "Sale Price" textbox in product edit page.
And it shows correctly in home page and product detail page. Please see the attaced picture 1. But if I add it into cart. It only shows the regular price in shopping cart summary box and the all the checkout page. Please see the attached picture 2.

If you changed your page display code to show the MSRP as the sale price in the product page, it still doesn't change what the cart is programmed to do. It's programmed to take the Price field and use it as the product price. The value in that field is what is put into the database when the customer puts the product in the basket. If you change the price displays to show Price instead of MSRP and Sale Price instead of Price and put your sale price figure into the Price box in the admin, then that is what the item would be priced when it is put into the cart. You are trying to do the opposite of how the cart was programmed.