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

No, I meant this:

SELECT-OPTIONS:
                  so_zshpc  for vbap-zzshipto_cust,
                  so_nwgew  FOR vbap-ntgew,

In your selection you have so_ntgew (first has a w other has a t).