Calling UDFs On Linked Server

Hello,

How can I call UDFs on linked servers in SQL Server 2005?

More details:

I have some UDFs on Instance "VAXPServerA" in Database "DB1", for example "getSomething(number)".

It might look like this (for example):

----
CREATE FUNCTION [dbo].[getSomething] (
@theNumber int
)
RETURNS int AS
BEGIN
DECLARE @result int
SET @result = theNumber * 5
RETURN @result
END
----

I can call this function inside of the DB by typing:

----
SELECT dbo.getSomething(5)
----

I also can call the function from another DB on instance "VAXPServerA" by typing:

----
SELECT DB1.dbo.getSomething(5)
----

I have a second instance called "VAXPServerB", and "VAXPServerA" is a linked server in "VAXPServerB". I can do selects and stuff, it works fine.
But when I want to call the function...

----
SELECT [VAXPServerA].DB1.dbo.getSomething(5)
----

I obtain the next error:

Msg. 207, Level 16, State 1, Line 1
The column name 'VAXPServerA' is not valid.


Any hint?

Thanks in advance

David