Is there a limit to add-ons in the library of FS2002

Since a few days I can't add scenery or mesh no more.
It seems like the library is full and can't take more scene
In the main FS2002 scenery cfg, we can't go further than [Area 724] and any new entry is done erasing the last one.
It's really annoying and I 've never had such a problem since I installed add-ons so far.
All my add-ons (sceneries, mesh, landclass ...) are kept
in a folder away from FS2002
If someone could help me I'd really appreciate :'(
Thanks for any help.
Will