overriding sub with function - bug or feature?

[Thomas Tempelmann <listuser at tempel dot org>]

I just noticed that the compiler does not complain that if
I have declared a function (returning something) in a class
and if I then provide a same-named method without a function
return in a subclass.

Example:

 Class1:
   function Validate() as Boolean

 Class2 (subclass of Class1):
   sub Validate()

Shouldn't this be disallowed?

Thomas