Can't park my domain

Hello everyone!

Here is my problem:
When I try to park my domain cabo.rs.ba it is always recognised as rs.ba
For some reason it deletes cabo part and I am not sure what am I doing wrong.

Any ideas?

Who is your domain registrar might be worth asking them

Thank you for your replay, but I am sure that is not the problem because I have some other domains with .rs.ba suffixes working perfectly well on other hosting websites.