Hi,
I usually work with a better bapi (in my opinion...) - BAPI_MATERIAL_SAVEDATA. U will find good documentatio in se37 (function module docu.) and also in trnx BAPI, under StandardMaterial -> SaveData (BUS1001006) in the documentation tab.
The parameters are itabs for each aspect of the material (plant data, storage location data, valuation data, etc).
As it is done in many BAPIs, here also, for each field u wish to update u have to put X in the corresponding field in the X structure (each itab in the parameters has a corresponding itab which is called the same as the original with an X suffix containing the same field list but they can contain only X).
Good luck
Igal
