ACL permission on NFS

[ubuntu]

I have two HP-UX machines, wbscsp01 and wbscsp02.
wbscsp02 has a logical volume bscs1, and it is mounted on wbscsp01 as bscs through NFS.
Further, the same logical volume is mounted on wbscsp02 as bscs through NFS (NFS serever and client are the same machine).

When I set ACL permission on files in bscs1 (on wbscsp02), I can use the privilages on bscs by login to the wbscsp01. But when I try to use the privilages of bscs by login to the wbscsp02, it says "Permission Denied".

Any suggestions to solve this?

Thanks