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: ZZZZZWESRW290
name: South Bucks District Council (No. 6) Tree Preservation Order 1993; dated 21/4/93; made under Section
tree-preservation-order: undefined
TPO/SBDC/1993/06
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.591754 51.564464,-0.591807 51.564536,-0.591861 51.564568,-0.591980 51.564571,-0.592006 51.564549,-0.592032 51.564517,-0.592072 51.564533,-0.592102 51.564552,-0.592128 51.564565,-0.592235 51.564571,-0.592227 51.564545,-0.592230 51.564515,-0.592236 51.564500,-0.592254 51.564480,-0.592260 51.564470,-0.592275 51.564457,-0.592279 51.564451,-0.592280 51.564439,-0.592278 51.564434,-0.592279 51.564427,-0.592265 51.564408,-0.592259 51.564405,-0.592248 51.564396,-0.592184 51.564320,-0.592148 51.564281,-0.592127 51.564261,-0.591853 51.564405,-0.591754 51.564464)))
point: POINT (-0.59204 51.564444)
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.