Release PO in background?

[Mike Pokraka]

G'Day folks,

Does anyone have a shortcut, secret function module or equivalent to
BAPI_PO_RELEASE to *reject* a Purchase Order on 4.7? There's
BAPI_PO_RESETRELEASE, but alas no reject.

I admit I'm being a little bit lazy here but
a) an hour searching/debugging has been fruitless
b) this seems normal enough that someone's come across this before, and
c) it's hometime and I'm hoping someone has a simple answer :-)

Any input appreciated,
Mike
 (Crossposted to WUG and SDN)