Checkbox field (field type string) with lookup table (to allow multiple selections)
Display and Edit work without any problelms
But currently it's not possible to search for values (display fields from lookup table) if there is more than one value selected (multiple selection).
This is according to the documentation Lookup Table, Option "Allow sort/search":
Limitations: 1. No multiple selection. Select Edit Tag with Multiple enabled and Checkbox Edit Tag are not supported.
Please remove that limitation. It substantially restricts the usability of multi-selection checkboxes (e.g. for tagging) when it's not possible to search for values (from lookup table) in case of multiple values assigned.