Hi,
You have to end a statement with a period '.' .
IF VBAK-AUART = 'ZASA'.
Z_BILL_AMOUNT2 = Z_QUOTE_VALUE_LEFT.
Z_BILL_AMOUNT = Z_VBAP_NETWR_SCHEDULE.
ELSEIF VBAK-VBTYP = 'G'
and VBAP-ABGRU = 'Z1' .
Z_BILL_AMOUNT2 = VBAP-NETPR.
ELSE.
Z_BILL_AMOUNT2 = Z_BILL_AMOUNT.
ENDIF.