About Prompted Filters
A prompted filter's operator is set to is prompted. This operator is valid for a column that contains text, numbers, or dates.
When you select the is prompted operator for a filter's column, you flag the column as ready to be filtered by a prompt. When a prompt is used, results include only records where the data in the column that is prompted matches the user's choices.
The is prompted operator is required for columns that are included in prompts where no prefiltered values are wanted.