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: ZZZZDVESXE712
name: The Bucks County Council (Amersham Rural District) Tree Preservation Order No 5 - 1952 Confirmed by
tree-preservation-order: undefined
TPO/1952/005
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.594308 51.607798,-0.594912 51.607857,-0.594914 51.607816,-0.594996 51.607786,-0.595051 51.607807,-0.595054 51.607862,-0.594990 51.608027,-0.594936 51.608241,-0.594891 51.608470,-0.594987 51.608464,-0.595013 51.608457,-0.595043 51.608446,-0.595072 51.608427,-0.595191 51.608307,-0.595217 51.608286,-0.595266 51.608254,-0.595347 51.608212,-0.595356 51.608209,-0.595746 51.608002,-0.595973 51.607886,-0.596305 51.607711,-0.596500 51.607592,-0.596556 51.607555,-0.596570 51.607544,-0.597162 51.607170,-0.597278 51.607093,-0.597270 51.607087,-0.597357 51.607023,-0.597493 51.606912,-0.597557 51.606850,-0.597014 51.607095,-0.596970 51.607109,-0.596722 51.607202,-0.596614 51.607232,-0.596258 51.607312,-0.595818 51.607416,-0.595768 51.607421,-0.595679 51.607426,-0.595397 51.607437,-0.595305 51.607438,-0.594729 51.607419,-0.594194 51.607406,-0.594187 51.607462,-0.594176 51.607497,-0.594159 51.607535,-0.594134 51.607574,-0.594081 51.607640,-0.593981 51.607752,-0.594308 51.607798)))
point: POINT (-0.595507 51.607663)
notes
entry-date: 2013-10-01
start-date: 2010-02-18
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.