BSYR234I Valid line commands for Aliases are: D-Display Data sets associated with Alias, M-Mergecat Data sets from one User Catalog to another, R-Rename the Alias.

Explanation
 This message is displayed when ? is entered in the line
command area to get help on valid line commands. The following line commands are valid in this line
command area: Enter D to display all the data sets using the alias. Enter M to perform a MERGECAT to
move this alias from one MVS usercat into another. Enter R to
rename all the IMS database data sets using this alias. 

User response
 None. This message is informational. 