I'm sure there's something incredibly simple (and obvious to someone 
  
else) I'm doing wrong here. My Explore command: 
  AddColumn(GetExtraData
("SIC"),"SIC"); results in "Error 5, 
  argument #1 has incorrect type
(the function expects a different argument 
  here)"
OK, so I change "SIC" to "QRS" and it works fine.
So why 
  can't I retrieve SIC numbers? I use QP with QP Plugin 1.6.0
TIA for any 
  help.
Chuck