Thanks for replay but here using multiple times for coding part that is write in PERFORM
FORM MOVE_DATA_IT_TO_WA.
WA_ST-MATNR = MARA-MATNR.
WA_ST-ERSDA = MARA-ERSDA.
WA_ST-ERNAM = MARA-ERNAM.
WA_ST-LAEDA = MARA-LAEDA.
MOVE-CORRESPONDING WA_ST TO WA_MARA.
ENDFORM.
I did not want write above type code that have more lines because using below type code this is working ,i know but in my program not working.
I want use FIELD: key word
FIELD: wa_st-matnr,
wa_st-ersda,
wa_st-ernam
wa_st_lead.