How to create a coupon code limited to an item

First you must create a coupon item. Then you create the coupon code and limit to the coupon item.

1. Go to Products -> Items, click on Add item and choose Coupon.
2. The Title can be what the code will be.
3. No description or category is required.
4. Price should be 0.
   1. You must set a VAT in order to save the product.
5. No need to define max redemptions.
6. Under Redeemable items you define the items the coupon code will give a discount on.
7. Save your coupon item. Now you can create your coupon code and limit to the coupon item.
8. Here you can read how to create the coupon code.