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: TPO813
name: 15/1986
tree-preservation-order: undefined
15/1986
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.677023 51.262319,0.677330 51.262484,0.677620 51.262627,0.677840 51.262758,0.677959 51.262785,0.678356 51.262834,0.678406 51.262849,0.678438 51.262885,0.678808 51.263583,0.678871 51.263679,0.679003 51.263971,0.679053 51.264050,0.679091 51.264139,0.679116 51.264158,0.679119 51.264170,0.679084 51.264187,0.679011 51.264201,0.678723 51.264293,0.678531 51.264342,0.678489 51.264362,0.678389 51.264360,0.678283 51.264390,0.677860 51.264462,0.677765 51.264495,0.677723 51.264485,0.677693 51.264463,0.677678 51.264438,0.677631 51.264414,0.677511 51.264193,0.677457 51.264162,0.677411 51.264122,0.677313 51.263989,0.677142 51.263730,0.676965 51.263353,0.676931 51.263225,0.676868 51.263076,0.676886 51.263055,0.676913 51.263043,0.677099 51.263042,0.677130 51.263023,0.677152 51.262995,0.677143 51.262930,0.677171 51.262890,0.677173 51.262876,0.677133 51.262779,0.677093 51.262644,0.677072 51.262602,0.676949 51.262499,0.676792 51.262420,0.676935 51.262275,0.677023 51.262319)))
point: POINT (0.677906 51.263516)
notes: Maidstone Borough Council Tree Preservation Order No 15, 1986 under Section 60 of the Town and Country Planning Act 1971 dated 18th July 1986. Confirmed 8th October 1986
organisation
entry-date: 1986-08-13
start-date: 1986-10-08
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.