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: TPO686
name: 4/1995
tree-preservation-order: undefined
4/1995
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.587464 51.289306,0.587525 51.289320,0.587567 51.289348,0.587604 51.289356,0.587672 51.289352,0.587798 51.289324,0.587836 51.289332,0.587900 51.289395,0.587999 51.289522,0.588003 51.289562,0.587995 51.289579,0.587938 51.289624,0.587857 51.289668,0.587824 51.289681,0.587748 51.289686,0.587704 51.289662,0.587702 51.289639,0.587764 51.289581,0.587774 51.289563,0.587773 51.289536,0.587719 51.289492,0.587536 51.289472,0.587472 51.289458,0.587417 51.289421,0.587389 51.289388,0.587395 51.289344,0.587413 51.289324,0.587464 51.289306)))
point: POINT (0.587735 51.289471)
notes: The Maidstone Borough Council Tree Preservation Order No 4 of 1995 under Section 198 of the Town and Country Planning Act 1990 Group of Trees - G1 consisting 7 Holm Oak, 4 Yewand 3 Beech
organisation
entry-date: 1995-01-24
start-date: 1995-01-24
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.