Bp update

Hi All,

I have a requirement to update the name4 field of Business partner of type organization.Name4 field is used for some temporory purpose and now it has to be replaced by space.

I am using the BAPI 'BAPI_BUPA_CENTRAL_CHANGE' to update this field but it is not updating..can any body pls help me..how can this be done..

Reagrds,

Sai