Oracle Advanced Pricing- Dynamic formula- secondary price list issue

Hi Folks, I am facing an issue in pricing side! I have written a dynamic formula which is working absolutely fine - if my dynamic formula didn't return the price then i want pricing engine should call the secondary price list what i have assign . But it is not at all going inside the secondary price list... For other places where i am not using dynamic formula there it is going inside the secondary price list and getting the price.. So can you please guide me to resolve my above issue! Thank you!