URGENT : Problem with SAP Note implementation

Hi Gurus,

I am implementing a SAP note which has got only 1 program change.

While implementing in Txn SNOTE,it pops up a window with another pre-requisite note which has changes in 3 different programs.

I understand that the pre-requisite note is already implemented in the system by an old Support pack.

My question is : Will this pre-requisite note overwrite the program(s) of the curent version ? Can I just go ahead with the implementation through SNOTE Txn and the system will take care of what is to be/already implemented by itself ?

Any help is gratefully appreciated,

Sandip.