remove it from the select statement
create a formula field with
datediff("d",cdate(right({WC4U999S.WS_DATE},5)+"-"+left({WC4U999S.WS_DATE},4)),CurrentDate)
place that formula field on the detail section and see if it is giving your the correct date field and it is running ok.
Edited by DBlank - 14 Nov 2014 at 11:45am