UPLEVEL CDS WARNING

Command ===>
                                                              
To Confirm Operation on the following CDS:
                                                             
CDS Name . . : SMS.SCDS
                                                             
Specify the following:
Perform Operation . . N (Y or N)
                                                             
IBM recommends modifying the SCDS on the highest level of DFSMS.
The SCDS being modified was found to have been modified by a
later release level of DFSMS. New features available in the
later release levels cannot be modified on this release.
Validation of the SCDS on this release will not validate new
features known only to later release levels.
It is recommended that you have a current backup of the SCDS before
modifying the SCDS on this release.
                                                             
Use Enter to Perform Operation;
Use Help Command for Help; Use End Command to Exit"

 From the DFSMS Migration manual: 
"A given level of the system can only validate consistency rules that it knows about... 
If you do not translate your ACS routines and validate your SCDS on the highest level of DFSMS, 
the translation and validation might fail. This failure occurs because some constructs and definitions 
are known only to higher levels of DFSMS. It can also occur due to changes in validation rules between 
releases. Once the control data sets are formatted by the higher-level system, the SMS control blocks 
reflect the new rather than the down-level lengths and control information." 

Last paragraph mentions: 
IBM recommends having a backup of the SCDS before modifying it at a higher level, 
in case you need to fall back. Additional information: OW37056 and OW37954