See http://reflector.sota.org.uk/t/sota-news-mar-2015-part-1/10321 :
SOTA Belgium
NEWS FROM THE “ON” ASSOCIATION - from Peter ON4UP
As from the 1st of March version 5.2 of the ON ARM is applicable.
http://www.sota.org.uk/Associations/viewAssociation/prefix/ON7
> ON/ON-018 ‘A la Plate’ is valid again: the latest NGI maps (www.ngi.be ) prove the prominence of 102m.
73, Peter - ON4UP
ON association manager