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: TPO723
name: 18/1986
tree-preservation-order: undefined
18/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.645511 51.294762,0.645583 51.294761,0.645580 51.294767,0.645996 51.295205,0.646043 51.295267,0.646107 51.295373,0.646319 51.295575,0.646645 51.295975,0.646743 51.296052,0.646889 51.296195,0.646932 51.296257,0.646953 51.296318,0.646951 51.296352,0.646930 51.296371,0.646818 51.296339,0.646720 51.296272,0.646517 51.296043,0.646319 51.295776,0.646211 51.295693,0.646023 51.295491,0.645967 51.295411,0.645903 51.295341,0.645711 51.295201,0.645641 51.295133,0.645581 51.295056,0.645527 51.295012,0.645472 51.294949,0.645419 51.294837,0.645419 51.294799,0.645445 51.294773,0.645511 51.294762)))
point: POINT (0.646148 51.295518)
notes: The Maidstone Borough Council Tree Preservation Order No 18 of 1986 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G7 - 21Ash, 18 Lime, 5 Field Maple
organisation
entry-date: 1986-08-13
start-date: 1986-07-19
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.