Explanation
XRC has detected a volume label change for the XRC swap utility volume volser1 at device address dddd. The new volume label is now volser2.
Note: 
A new volume label volser2 is the
current volume label and may not be the volume label that is currently
in the MVS™ configuration as shown
by the display units command. Although not necessary to successful
XRC execution, to make the volume label match the MVS configuration, a vary offline and vary online
of the device can be executed to refresh the MVS configuration.
A new volume label volser2 is the
current volume label and may not be the volume label that is currently
in the MVS™ configuration as shown
by the display units command. Although not necessary to successful
XRC execution, to make the volume label match the MVS configuration, a vary offline and vary online
of the device can be executed to refresh the MVS configuration.System action
XRC functions for the swap volume have now changed to the new volume label of volser2.
System programmer response
Verify that you intended the swap volume to change volume serial number from volser1 to volser2. The primary volume may be online or offline during both XSTART and XADDPAIR.
Source
Extended remote copy (XRC).