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: TPO348
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.673147 51.272323,0.672745 51.272077,0.672169 51.271687,0.671905 51.271546,0.671720 51.271400,0.671448 51.271230,0.671972 51.270997,0.672294 51.270874,0.672371 51.270837,0.672421 51.270837,0.672913 51.271074,0.673079 51.271175,0.673242 51.271306,0.673369 51.271390,0.673639 51.271598,0.673784 51.271696,0.674011 51.271917,0.674001 51.271948,0.673965 51.271976,0.673649 51.272101,0.673439 51.272210,0.673147 51.272323)))
point: POINT (0.672777 51.271561)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W17 Mixed Deciduous trees consisting
organisation
entry-date: 1987-07-14
start-date: 1987-07-09
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.