error messaje BM302 with BAPI_MATERIAL_SAVEDATA

Hi;

I´m working with Bapi BAPI_MATERIAL_SAVEDATA, mi problem is with the GEWEI field, i get the error message BM302 "Internal unit g, language ES is not maintained", and display "*****".

what i see is that the gewei value "g" is translated to "*****" when launch the order CALL FUNCTION 'BAPI_MATERIAL_SAVEDATA'.

how can i fix this...?

Thanks on advance.