Goods Movement Bapi for Subcontracting PO

Hi

I want to consume the actual consumption of components which was provided to vendor for subcontracting PO. While executing BAPI_GOODSMVT_CREATE for sub contracting PO , system automatically takes the consumption of the component  based on BOM.

My requirement is that consumption of material should be based on actual consumption which i am storing during the process.

Any idea how can i do it using the bapi??