RACF commands can be executed via LDAP using the CMDLINE parameter:
cmdline=DEFINE ALIAS(NAME XXXXXXXX) RELATE(USERCAT.CATXXX))
This command returned the following error message:
LDP1999E Error issuing command with R_Admin, <>
Release : 15.1
The command line processing is only for ESM (RACF, ACF2 and TOPSECRET) commands.
Define Alias is a z/OS command not an ESM command
As previously mentioned there is a CA-LDAP parameter that will create an alias when a tso user is setup - CreateAlias
Details can be found at the following techdoc location.