Master data Load for Substance Creation : Using BAPI in LSMW ?

Hi ,

Had any one did a Master data load for creating a Substance in SAP RM. If so please let me know the best possible option. I am beeing trying to figure out the option to load Substances and its IDENTIFIER / MATERIAL ASSINGMNET from my legacy system. But I am not geeting a clue to use LSMW. ( Direct or BatchInput )

I am not seeing any BAPI for uploading it through the LSMW except the one BUS1077 ( method SAVEREPMUL ) and I guess this is used along with IDOC.

Appreciate your help and suggestion.

David