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: ZZZZDVESXE743
name: The Bucks County Council (Amersham Rural District) Tree Preservation Order No 8 - 1949 Confirmed by
tree-preservation-order: undefined
TPO/1949/008
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.734214 51.716551,-0.734364 51.716574,-0.734313 51.716514,-0.734168 51.716108,-0.734172 51.716077,-0.734195 51.716020,-0.734196 51.715979,-0.734127 51.715783,-0.734129 51.715759,-0.734114 51.715713,-0.734048 51.715342,-0.731447 51.715110,-0.731404 51.714822,-0.731360 51.714822,-0.731247 51.714955,-0.731167 51.715091,-0.731116 51.715204,-0.731101 51.715252,-0.731101 51.715286,-0.731118 51.715325,-0.731155 51.715367,-0.730974 51.715569,-0.730798 51.715712,-0.731129 51.715831,-0.731657 51.715937,-0.731904 51.716015,-0.732417 51.716134,-0.732683 51.716205,-0.733304 51.716391,-0.734214 51.716551)))
point: POINT (-0.732716 51.715727)
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.