Doubt in Internal table

Hi All

I need to send value from itab1 and ita3 to it_final_data with some validation.

Its going dumb .pls clarify me if I have done mistake

LOOP AT itab1 INTO wa1.

READ TABLE itab2 INTO wa2 WITH KEY matnr = wa1-matnr.

IF sy-subrc = 0.

MOVE-CORRESPONDING wa1 TO wa_final_data.

APPEND wa_final_data TO it_final_data.

ENDIF.

BREAK-POINT.

LOOP AT itab3 INTO wa3.

READ TABLE itab1 INTO wa1 WITH KEY kunag = wa3-kunnr.

IF sy-subrc = 0.

MOVE-CORRESPONDING wa3 TO wa_final_data.

MODIFY it_final_data FROM wa_final_data.

ENDIF.

ENDLOOP.

To be reward all helpful answers.

Regards.

JNJ