You are asked for this only if you have specified a fast pass table. You use this option to specify the formula for the criteria for record selection. The condition is applied to each record of the fast pass table.
Using a condition to list from the fast pass table restricts the records to be scanned to those meeting the fast pass selection criteria. Any other conditions (such as a list/delete condition) are then applied only to those records. Any field(s) in the fast pass table can be used in the formula, provided they have previously been set up in the list of fields. You can also use non-database fields, which are defined using fields, in the fast pass condition.