The following error message typically occurs when an NF function references a cell or function that does not contain a record key:
This error was added in Jet Reports 2009, so if you had a report that was not giving this error before upgrading to Jet Reports 2009, the upgrade may cause this error to occur. In previous versions of Jet Reports, an NF that referenced a cell that was not a record key returned blank.
The error can be resolved simply by changing the cell reference in the problematic NF function to point to a record key. A record key is an NL function in which the field has been left blank.