If you are using the MYOB Integration feature of M-Power you can export Purchases to MYOB.
This is done using Bills rather than Purchase Orders. A purchase order is
a request to a supplier. The supplier will issue an
invoice based on what they actually supply you. The bill is created
in M-Power to mirror the suppliers invoice (a suppliers invoice may contain
more than one of your PO’s in some cases.
The bill is then
sent through to MYOB because that is what the supplier expects to be paid