Dear Alfredo,
This is a quite common requirement of the End user. As you know, we don't create all GL masters in our Golden Environment, progressively GL numbers get increased in PRD, so they don't get fetched in FSV version until unless you are having the full range assigned to the nodes.
There is a very good document written by Consultant Khan about this setting. please find link below.
http://scn.sap.com/docs/DOC-51491
Also, please have a idea about current settings tick mark in IMG activity.
Am sure, this doc will be helpful to you,
There is one more trick to tweak FSV changeable. Not recollecting right now but will inform you once I will recall.
Thanks
Kind Regards
P