Change the input component quantity of an order

Hi,

Using BADI CHANGE_SAVEMULTIPLE2 within SaveMultiple2, I need to change the input component quantity of an order that is being saved. I have the order number and the quantity in the extension_in table. What I couldn't find is where to set this value. I don't know which APO table should I look in order to update this new value.

Thanks in advance for any suggest.