Can I make custom products as a value for a promotion

Hi,

Next week we have to offer custom products on our new site. Thereby I would like to make a promotion with the advanced promotion suite were the promotion is only valid if a product is customized. Is this possible and how do I have to make settings for this? It should give 30% discount with a specific vouchercode on product which are customized. If the product isn’t customized there should be no discount.

Thanks for your help and tips
Rutger (Shopware newbee)