[sv-cc] vpiClassDefn from vpiClassObj

Hi,
I have another question:
 
if I can get vpiClassTypespec from vpiClassObj and I can get
vpiClassDefn from vpiClassTypespec
 
Why I cannot get vpiClassDefn from vpiClassObj ?
 
i.e:
 

 
Is there is any reason why I cannot do it ?
In code there whould be one rountine call in place of two calls
 
Regards,
Radek