how to setup SO or PO posting process as mandatory

Hi All

How to setup Sales Order or Purchase Order posting process as mandatory?

for eg: for Import Purchase order Invoice registration and Bill of entry posting is mandatory for for normal PO it is not required.

While using of serial number s or barcode in PO and SO, packing slip postingis mandatory in PO to Inventory registartion and Picking list posting is mandatory for SO to inventory reservation.

if simple PO or SO, after creating lines directly user can do Invoice posting.

There is nothing as standard that will do this, although of course if the item has a serial number and registration is set in the model group it is mandatory - but I am presuming you mean this outseide of the standard restrictions that would make the processing required.