Explanation
The device denoted by volser bad_volser with
device bad_device for the triplet with primary
volser pvolser primary device pdevnum,
secondary volser svolser secondary device sdevnum,
swap volser swapvol swap device swapdev with
a device_type of PRIMARY, SECONDARY, or SWAP is
already in XRC session2, and therefore cannot be
added to session1. 
Note that swap VOLSERs are denoted as *SWAP* (excluding swap utilities) and any unavailable VOLSER is denoted as *OFFL*.
In the message text:
- command
- The XRC command issued.
- TRIPLET(pvolser/pdevnum,svolser/sdevnum,swapvol/swapdev) FOR SESSION(session1)
- Information for the primary device triplet that the command was
unable to add to XRC session session1.
- pvolser/pdevnum
- The primary device number and volser for the device triplet.
- svolser/sdevnum
- The secondary device number and volser for the device triplet.
- swapdev/swapvol
- The swap device number and volser for the device triplet.
- session1
- The session name for the XRC session the command tried to add the device triplet to.
- DEVICE(bad_volser/bad_device) IS A device_type IN SESSION(session2)
- Information about the device causing the command to fail because
the device already exists in XRC session session2:
- bad_device
- The device name for the device that already exists in XRC session session2.
- bad_volser
- The volume serial number for the device that already exists in session2.
- device_type
- The device type, PRIMARY, SECONDARY, SWAP, or SWAP-UTILITY, of the device that already exists in session2.
- session2
- The XRC session where the device type already exists.
System action
XRC function is active.
System programmer response
The device is already managed as a
primary volume, secondary volume, or a swap volume in another XRC
session. To use the device in the new session, it must be removed
from the other XRC session:
- If the bad_device is incorrectly associated as device_type with the triplet, XDELPAIR the primary device associated with the bad_device or bad_volser on session2, and then use GDPS® to XADDPAIR it to session1.
Source
Extended remote copy (XRC).