DSNL306I THE MAXIMUM NUMBER OF SUPPORTED ALIASES HAS BEEN EXCEEDED.

Explanation
The modify DDF command was issued to add a new
alias, but the new alias would exceed the maximum number of aliases
that can be defined. You can define as many as 40 aliases by using
the MODIFY DDF command.

System action
The command is not processed.

User response
Delete unneeded aliases before adding additional
aliases. You can use the output from the DISPLAY DDF command to see
the list of currently defined aliases.