To change the classification data for a material using BDC

I have to update clssification data for material in MM02 using BDC so when i record the transaction MM02 using SHDB i am not able to see the value assignment window which i a able to see when i am changing using MM02 transaction directly. So can anyone have an idea regarding this ?

I have even tried updating classification data using a BAPI BAPI_OBJCL_CHANGE but i am not getting desired results....can anyone suggest me what are the parameters need to be passed to the BAPI. Thanks in advance for your help....