@Bookworm
After some research, I don't think this SASKI - COA thing has a simple answer. I understand the reasoning of the Letter of Agreement between LTC and Brussels ACC (SASKI - COA is opposite to the departures from EBBR/EBMB and EBAW).
So, the LoA is not clear, the RAD says nothing and the Belgian AIP gives the restriction above FL115 only.
I'll have a talk with someone on wednesday, let's see what he says...
An additional problem might be that about 2/3 of the airway between SASKI and COA is in the Dutch FIR and is delegated to Brussels ACC.
Anyway, we are going a bit off topic here but if you want i'll PM you anything I can dig up.
OH, and no, I'm not a supervisor, just a regular ACC ATCO