Dear Rett and all,

I'd just like to add more to Suan's source for the inclusion of the
Abhidhammapi.taka in the Khuddakanikaaya. It is also found in the
introductory sections of the commentaries to the Vinayapi.taka and
Diighanikaaya. This is all part of the different ways in which the
Buddhavacana can be divided up. Here's a brief overview from the
Vinaya commentary (Sp I 16):

onefold: by way of taste (rasavasena)
twofold: by way of the dhamma and the vinaya
threefold: a) by way of the first, middle, and last (words of the
Buddha); & b) by way of the pi.takas (in which the
suttantapi.taka is divided up into five nikaayas -- not to be
confused with the following)
fivefold: by way of the nikaayas
ninefold: by way of the a"ngas
eighty-four thousandfold: by way of units of the dhamma
(dhammakkhandhavasena)

The commentary (Sp I pp. 16-30) goes into much more detail.

Best wishes,
Jim

Suan wrote:
<<Dear Rett, Gunnar Gallmo, Thomas Law and all

Here is the source that describes Abhidhamma Pi.taka as belonging to
Khuddakanikaayo.

"Katamo khuddakanikaayo? Sakalam vinayapi.takam,
ABHIDHAMMAPI.TAKAM, khuddakapaa.tha, dhammapadaadayo ca pubbe
dassitaa paƱcadasappabhedaa; .thapetvaa cattaaro nikaaye
avasesam buddhavacananti."

The above quote can be found on page 25 of A.t.thasaalinii, the
Commentary On Dhammasanganii (Roman script). >>