DFS3866 BACKUP KEYWORD INVALID - NO MODSTAT2

Explanation
 The XRF alternate (backup) IMS system
issues this message if an /ERE command with the
BACKUP option is entered, but no MODSTAT2 is available.

System action
 The /ERE command is rejected.

Operator response
 Notify the IMS system
programmer.

System programmer response
 Make sure the MODSTAT2 ddname is
specified in the JCL procedure and the data set exists.