What are the details of the promotion being applied?
Have you customized promotion that you are applying? Couple of things to check -
1. You don't have multiple promotions active for the same item and same amount if any threshold is limited. This will conflict and not a valid case.
2. Check for promotion processor if you have it customized.
Hi Surjit and Manoj,
First of all thanks for your response.
I have created a Campaign and in that have two discounts
1. Item Discount (20% off) : 20% off on particular category items, it is applied automatically
2. Order Discount (Spend100) : 10% discount on spend of 100, it is applied with promotion code
I have not customized promotion and there's no limits set.
Extension Method in EPiServer.Commerce.Order.IOrderGroupExtensions
When this method is called on order object it is adding duplicate line item and removing the other line items. This is the case only when If you have created a Discount/Promotion and has Product in the `This discount does not apply to these catalog items` list. Then if you have that product addedf in cart along with other products in that case above specified method add's duplicate line item.
Example:- Suppose you have Product A in excluded list and Product A and Product B in cart then on Applying discount you will have two products and both will be Product A.
Because of this we are getting an exception of duplicate line item. I guess it should not have added duplicacy and either provide error or apply discount only to Product B as per example case.