0Material Enhancement Problem

Hi All,

   I have enhanced 0material_attr extractor with 2 fields MMSTA and MTVFP. These  2 fields data is  filled from MARC table.I have written below code in user exit .

Table : MARC.

Data: rec_mara_s like  biw_mara_s.

Data: VA_MMSTA LIKE MARC-MMSTA,

         VA_MTVFP LIKE MARC-MTVFP.

WHEN '0MATERIAL_ATTR'.

LOOP AT I_T_DATA INTO rec_mara_s.

CLEAR: VA_MMSTA,VA_MTVFP .

IF SY-SUBRC EQ 0.

rec_mara_s-MMSTA  =  VA_MMSTA.

rec_mara_s-MTVFP =  VA_MTVFP .

ENDIF.

MODIFY I_T_DATA FROM rec_mara_s.

ENDLOOP.

i have executed RSA3 i did not found any data for new fields even though MARC table is having data.Please help with this issue

Thanks

J