Patch 10043072:R12.HZ.B

I have a question on patch  10043072:R12.HZ.B. Which states

One of the note states as follows:

"patch will add the Dunning Letter Set Name field back to the Customer profile. Additionally, when you populate the Dunning Letter Set Name field on the Dunning Plan, the Dunning Plan will then process only Dunning Letter Set name in their customer profile. This will allow you to send a set of Customers a specific Dunning Letter, without having to purchase the Advanced Collections license and create a custom scoring. If you do not have a Dunning Letter Set name in the Customer profile, but you populate the Dunning Letter Set name in the Dunning Plan, it will result in