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: ZZZZDVESXE710
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 (((-0.594980 51.604721,-0.595115 51.604697,-0.595159 51.604591,-0.595186 51.604459,-0.595196 51.604315,-0.595169 51.604233,-0.595159 51.604157,-0.595129 51.604096,-0.595003 51.603950,-0.594967 51.603934,-0.594935 51.603934,-0.594650 51.603994,-0.594570 51.603990,-0.594527 51.603960,-0.594325 51.603713,-0.594121 51.603770,-0.594269 51.604017,-0.594134 51.604043,-0.594029 51.604032,-0.593922 51.604049,-0.593816 51.604083,-0.593689 51.604165,-0.593585 51.604156,-0.593342 51.604091,-0.593110 51.604076,-0.592887 51.604089,-0.592560 51.604154,-0.592110 51.604280,-0.592131 51.604287,-0.592141 51.604299,-0.592722 51.605184,-0.594980 51.604721)))
point: POINT (-0.59371 51.604488)
notes
organisation
entry-date: 2010-02-18
start-date: 2010-02-18
end-date

Your dataset is missing the tree-preservation-order column.

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

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