BAPI To Change the BOM

Hi,

I have a requirement to change the existing BOM using BAPI.

Currently for creation i am using the BAPI - BAPI_MATERIAL_BOM_GROUP_CREATE.

Kindly help to find a BAPI  to update the BOM if any change in the existing component.

For example Change in the quantiyt of an existing componenet.

Thanks & Regards

Brijo.