Tree preservation zone

There is a problem

1000 entries with tree-preservation-order field must match the reference field in the tree preservation order dataset

reference: ZZZZZXESRW175
name: South Bucks District Council (No. 31) Tree Preservation Order 1995; dated 31/5/95; made under Sectio
tree-preservation-order: undefined
TPO/SBDC/1995/31
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.565989 51.575927,-0.565790 51.575722,-0.565591 51.575520,-0.565546 51.575471,-0.565327 51.575248,-0.565111 51.575335,-0.565069 51.575350,-0.564999 51.575379,-0.564676 51.575506,-0.564674 51.575508,-0.564644 51.575519,-0.564502 51.575578,-0.564434 51.575612,-0.564282 51.575693,-0.564041 51.575879,-0.563860 51.576035,-0.563727 51.576164,-0.563399 51.576511,-0.563556 51.576649,-0.563661 51.576747,-0.564408 51.577035,-0.564622 51.576820,-0.564628 51.576824,-0.564662 51.576790,-0.564881 51.576600,-0.565032 51.576455,-0.565140 51.576324,-0.565394 51.576204,-0.565989 51.575927)))
point: POINT (-0.564654 51.576133)
notes
entry-date: 2017-07-04
start-date: 2017-07-04
end-date

Your data is missing a tree-preservation-order.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.