Using function Previous(fld) in the Record Selection Formula Editor

[buckbuck]

I am trying to limit my record selection by using a formula in the Record Selection Formula Editor. However, when I try to use the Previous (fld) or Next (fld) functions, I get the following error: This function cannont be used because it must be evaluated later.

Any ideas on this? Thanks.

 

[MalcolmW]

You can use these functions to suppress the printing of records, etc, but not the reading of records from the database. This is because the final order of the records as printed on the report is often determined after the records are read, so the definition of what is "next" or "previous" is still open to change. Malcolm