=IF(COUNTIFS(Entries!$B$10:$B$104,A2)>=1,"",ROW())
On the "Presenatation Data" sheet I am using a COUNTIF function to remove , previously used id numbers to avoid duplicates. But the formula that I am using has lost the 1st number in the list ie.1 which has been used and consequently the 2nd column does not read correctly against the preliminary column. The (Entries!$B$10:$B$104) refers to the target sheet that the application forms are recorded on, If I put A1 in place of a2 I get the same error. Help appreciated . Thanks Jim