The primary reason multiple-select fields cannot be used as filters is due to how these fields are structured and stored within the system. Multiple-select fields allow users to select more than one option from a list, which complicates the filtering process.
Recognizing the need for improved functionality, there has been an enhancement request filed under Enhancement 164787. This request specifically addresses the following capabilities:
- Ability to Mark Show In Filter Region: This feature would allow multiple-select fields to be displayed in the filter region of saved searches.
- Show As Multi-Select: This enhancement would enable multiple-select fields to be used as multi-select filters, allowing users to filter search results based on multiple values within the same field.