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: TPO710
name: 18/1986
tree-preservation-order: undefined
18/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.637729 51.294479,0.636910 51.294339,0.636503 51.294317,0.636288 51.294317,0.636134 51.294330,0.636074 51.294316,0.636079 51.294299,0.636145 51.294266,0.636293 51.294226,0.636404 51.294207,0.636589 51.294207,0.637088 51.294244,0.637986 51.294419,0.638114 51.294461,0.638216 51.294505,0.638412 51.294555,0.638472 51.294604,0.638466 51.294629,0.638429 51.294631,0.638215 51.294570,0.637965 51.294517,0.637828 51.294501,0.637729 51.294479)))
point: POINT (0.637247 51.294362)
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 - G19 - 1 Sycamore, 1 Ash, 12 Oak
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.