CMMVC9265E The volume specified has a thin or compressed volume copy in a data reduction pool. Thin provisioned or compressed volumes created from a data reduction pool can not use -size parameter to reduce the size of the volume.
Explanation
You cannot use the -size parameter to shrink thin-provisioned or compressed volumes that were created from a data reduction pool.
User response
Retry the command and specify a regular disk or a disk from a regular pool.