Multiple discounts using more than one discount list

Summary

is possible to apply more than one discount list to the same item?

Content

I have multiple price strategies each one has one price list and one discount list that apply to all items. Additionally, we want to create and additional discount list that applies for a subset of items and for a specific period of time. However, after adding the second discount list to my strategy, OM is only applying the discount from one of the discount lists - the item-specific one. 

Is it a normal behavior or is it possible to have more than one discount list per strategy.??