[O] using custom ids

[Rustom Mody]

After Nicholas recently directed my attention to custom_ids Ive been using them.

Now I find this:
In a file say foo.org, I have an anchor point and a link point.

If I write the anchor as
* Head <<ppe>>
I can write the link as [[ppe][Description]]

However if I write the anchor as
* Head
:PROPERTIES:
:CUSTOM_ID: ppe
:END:

then the above link does not produce an html link at all
Instead Ive to write
[[file.html#ppe][Description]]

Is this expected behavior? Am I missing something?

Thanks
Rusi