Hi Aneel Munawar,
Data lv_zy type c length 2.
lv_zy = 'Z1'.
or lv_zy = 'Z2'.
or lv_zy = 'Y1'.
so any value you wnat to assign to lv_zy, you can just pass as parameter,
PERFORM XVBPA_LESEN(SAPFV45K) USING LV_ZY VBAP-POSNR SY-TABIX.
MOVE XVBPA-PARVW TO TKOMK-WTY_V_PARVW.
MOVE XVBPA-kunnr TO TKOMK-WTY_V_PARNR.
Regards
Ibr