[exim] filters files

Hello,

I hope Iwon't multipost but ,having already posted few hours ago and
never saw my messages appear onthe list... I do it again.

I want to setup sieve filtering for virtual user in exim 4.69 (Debian
Squeeze).
My sieve filter looks like this:

        # Sieve filter
        require ["fileinto"];
        # rule:[another]
        if anyof (true)
            {
            fileinto "Drafts";
            }

but when its proceeded I get this error:

...
Considering Drafts
unique = Drafts:user@???
...
22:43:14 30035 == save Drafts <lolita@???> R=ldapsieve
T=address_directory defer (-21): appendfile: file or directory name
"Drafts" is not absolute

I have read that Exim Should understand non-absolute name as relative to
home.... so why it doesn't?