Another Metaobject issue.
The Oven page has objectsreq = [[requires::Brick]] x30
http://ringofbrodgar.com/wiki/OvenThe Ore Smelter page has objectsreq = [[requires::Brick]] x45
http://ringofbrodgar.com/wiki/Ore_SmelterHowever the Brick page:
http://ringofbrodgar.com/wiki/BrickDoes not have the Oven listed in Required By (though it does have the Ore Smelter).
There are similar problems with boughs, bars of metal and other things. It seems selective for some reason, and I can't seem to see anything in the metaobject that might fix it.
Not sure if there is anyone around that still is familiar with the metaobject. Or if someone has some way to contact the people who do.