welcome back brabus!
how was the week off?
I noticed RRSDA too but doesnt appear to be listed...
Havent seen many consolidations in my time but can RRSDA be used to hold 1 new RRS (for 20 old RRS) once they are transferred (old) RRS is removed, and RRSDA loses the DA and becomes the new RRS.
In my (computer nerd) opinion its just a place holder because the system can't handle putting on RRS (old) and RRS (new) at once.