The IN operator with "SO_NTGEW" is followed neither by an internal table nor by a value list.

Here is my program starting at the select options.

   SELECT-OPTIONS:
                  so_zshpc  for vbap-zzshipto_cust,
                  so_nwgew  FOR vbap-ntgew,
                  so_name1  for kna1-name1,
                  so_vdatu  for vbak-vdatu,
                  so_vbeln  for vbak-vbeln.

   START-OF-SELECTION.
PERFORM f_populate_table.
PERFORM f_write_list.

END-OF-SELECTION.

FORM f_populate_table.

  SELECT zzshipto_cust vbeln ntgew into (int_cust_tab-zzshipto_cust, int_cust_tab-vbeln,
    int_cust_tab-ntgew)
    FROM vbap
    WHERE zzshipto_cust in so_zshpc
    AND vbeln IN so_vbeln
    AND ntgew IN so_ntgew.

The syntax error is in the last line.

Any ideas?