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: TPO42
name: 3/1973
tree-preservation-order: undefined
3/1973
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.597335 51.211587,0.597338 51.211753,0.597309 51.211825,0.597262 51.211875,0.597058 51.212008,0.596973 51.212022,0.596939 51.212053,0.596956 51.212059,0.596978 51.212089,0.596986 51.212150,0.597047 51.212225,0.597123 51.212284,0.597166 51.212307,0.597118 51.212348,0.596971 51.212517,0.596876 51.212580,0.596608 51.212662,0.596487 51.212713,0.596462 51.212707,0.596430 51.212712,0.596418 51.212731,0.596369 51.212742,0.596335 51.212691,0.596274 51.212440,0.596155 51.212466,0.596073 51.212337,0.596086 51.212205,0.596119 51.212191,0.596034 51.211941,0.596443 51.211767,0.596651 51.211706,0.597082 51.211631,0.597243 51.211594,0.597335 51.211587)))
point: POINT (0.596654 51.212133)
notes: County of Kent (Hollingbourne Rural District) Tree Preservation order No 3 of 1973 made under Section 60 of the Town and Country Planning Act 1971 Area of Trees - A1 - 7 Limes, 4 Beech, 2 Ash,
organisation
entry-date: 1974-03-18
start-date: 1973-02-15
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.