BAPI_PO_CHANGE update PO Quantity and Amount

Hi Experts,

I have a requirement to update PO quantity and Amount of a PO.

I have used BAPI_PO_CHANGE to update the quantity of PO. I've tried it first using SE37 before using it.

However the return value says its succesfull but its not updating.

Import Parameters:

PURCHASEORDER = PONUMBER

Tables:

POITEM

PO_IT = 00010

QUANTITY = 1

POITEMX

PO_IT = 00010

QUANTITY = X