How to search Business Partner with natural person flag

Business Partner is created with a flag "natural person" , basically a tick box under the tab "identification" > section "Tax number.

Field name=NATPERS

When I search this BP in table BUT000, this flag is not picked up...I can search the business partner but i dont see any flag against the field BUT000-NATPERS.

any reason why? or is there a better way to search this?