ok thanks Apprentice, that's what I thought. Hopefully the people at FXCM can fix that.
this is what he told me:
Thank you for contacting our programming services team. There are no restrictions against using the Directional Real Volume indicator in a Lua strategy you are coding. If you are an independent developer looking for coding assistance, you should direct your questions to the forums on FXCodeBase:
http://fxcodebase.com/