BSYR127E Invalid command - Please enter "D" to display all data sets
using this alias, "M" to mergecat this alias into another catalog,
or "R" to rename all IMS object
data sets using this alias.
Explanation
An invalid line command was entered.
User response
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.