Hi all Here is the problematic code : data test;      dsid=open("Work.PB_Y1999_A1_North");      NbDeleted=attrn(dsid,"NOBS");      rc=where(dsid,'Problem=AreaLimits');      DeletedAreaLimits=attrn(dsid,"NLOBSF");      rc=close(dsid); run; It says : ERROR 68-185 The function WHERE is unknown, or cannot be accessed. Now, the file does exist, has a column called Problem (and it works when I manually filter by entering "where Problem=...." in the top left box). I use SAS 9.1 Thanks in advance if anyone can help ! ... View more