Source: NCP Engine
Explanation: The NCP engine could not rename across volumes because the source volume and destination volume are different.
Action: Although the RENAME command can move a file between directories on the same volume, using RENAME to move a file between volumes is not allowed.
If you have sufficient privileges on both NSS volumes, you can map a drive to each volume, and then use the Client for Open Enterprise Server's copy option to copy the file or folder between the two volumes along with the trustee and file access metadata.