HCP: host header for xs application

Hi,

Can anyone point me to the configuration we need to setup in order to use ours ISP registered CNAME pointed to HCP dns?

e.g. we have HCP dns name like "<account name>.hana.ondemand.com" we want it to be resolved to our url like "mycompany.com"

for that we have "mycompany.com" cname registered  and pointed it to "<account name>.hana.ondemand.com"

But it looks like HCP does not accept an all catch host header (*) and we are not sure where this can be configured , so that we only get "Service Unavailable" error. Pinging "mycompany.com" shows that its correctly resolved to "<account name>.hana.ondemand.com", but then HCP rejects that

Thanks!

Artem