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: TPO533
name: 11/1981
tree-preservation-order: undefined
11/1981
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.504963 51.271107,0.504996 51.271230,0.505037 51.271342,0.504974 51.271332,0.504935 51.271299,0.504911 51.271244,0.504837 51.271128,0.504792 51.271095,0.504730 51.271076,0.504508 51.271096,0.504445 51.271086,0.504397 51.271068,0.504361 51.271038,0.504329 51.270994,0.504684 51.270932,0.504792 51.270923,0.504852 51.270927,0.504901 51.270950,0.504921 51.270975,0.504963 51.271107)))
point: POINT (0.504735 51.271061)
notes: Maidstone Borough Council Tree Preservation Order No. 11 of 1981, under Section 60 of the Town and Country Planning Act 1971. Group of Trees - G1 comprising Black Pine (Pinus Nigra)
organisation
entry-date: 1981-08-04
start-date: 1981-08-04
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.