Hi Jayalakshmi,
Try the below code.
Go To CMOD--Create the project name starts with ZXXXX.---> add RSAP0001--> click on the enhamcement components-->double click on EXIT_SAPLRSAP_002--> it will takes you to include ZXRSAu02--> double click on this include --> and write your code.
CASE I_DATASOURCE.
C_T_DATA_TAB = C_T_DATA.
WHEN '0MAT_PLANT_ATTR'.
LOOP AT C_T_DATA_TAB INTO C_T_DATA_WA.
L_TABIX = SY-TABIX.
SELECT SINGLE eisbe
INTO C_T_DATA_WA-eisbe
FROM MARC
WHERE MATNR = C_T_DATA_WA-MATNR.
if sy-subrc = 0.
C_T_DATA_WA-yyeisbe = C_T_DATA_WA-eisbe.
MODIFY C_T_DATA_TAB FROM C_T_DATA_WA INDEX L_TABIX .
endif.
ENDLOOP.
C_T_DATA = C_T_DATA_TAB.
endcase.
Let me know if any issues.
Regards,
Gurunath Kumar D