When you try to delete the system property which is in use it fails with the
message that the property is in use. But it doesn't print the config element in
which the property is referenced.
In the following case the listener httpls1 is referencing the property, the
error message should say the property is in use by the element httpls1.
aroot@easqeopt19:~# asadmin delete-system-property port
com.sun.enterprise.admin.cli.CommandException: remote failure: System Property
port is referenced by [network-listener:port] in the configuration. Please
remove the references first.
Command delete-system-property failed.
aroot@easqeopt19:~# asadmin get "*" | grep httpls1