How to pass the condition vallues in bapi BAPI_PO_CREATE1 for items as well

HI,

where to pass the condition value table in bapi BAPI_PO_CREATE1 item level as well as header level

Like Frieght charges,discounts, basic price ,VAT,CST etc.

Is there any BAPI for GR tcode MIGO.

Pl send along with simple examples .

Your answeres will be rewarded.