A PPRC CESTPAIR command was issued for primary device device-info with MODE(COPY) and the specified secondary is already the source of a FlashCopy® relationship whose target is a space efficient volume. The PPRC copy process results in all tracks being updated on the secondary device (FlashCopy source) and a full copy to the space efficient target.
CESTPAIR command fails.
The FlashCopy relationship must be withdrawn before the PPRC establish pair command is completed.
Peer-To-Peer Remote Copy (PPRC).