Upload Of Vendor Create Data using LSMW

Hi,

I am trying to upload the vendor data for more than 1000 records from flat file structure to sap using LSMW (standard batch/ direct input) for XK01 transaction code. For uploading the house and street address i have created additional fields STR_SUPPL1 and STR_SUPPL2 in addition to STRAS. But in "Maintain Field Mapping and Conversion Rules" I am not able to locate the fields for mapping STR_SUPPL1 and STR_SUPPL2. Can any one please suggest me how to go about it. Thanks in advance.

Regards,

Sangram