Hi all, i know its little offtopic, but from my crafting/RE experience (Artifice) i can say the following:
1) Exist items that doesn't allow RE(for example some offhand shields). As artificer i can craft/re some of them, but others has RE button disabled
2) Exist items that on RE disappear with message "No reverse engineering information for item"
3) All other items who on RE return some materials(and probably new schematics)
So, if you are able to RE your item, and it returns to you some material then i think it probably can give you new schematics