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: TPO510
name: 17/1986
tree-preservation-order: undefined
17/1986
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.639129 51.279842,0.639180 51.279960,0.639098 51.280014,0.638756 51.280163,0.638621 51.280213,0.638222 51.280446,0.637897 51.280561,0.637487 51.280646,0.637215 51.280792,0.637102 51.280841,0.636752 51.280970,0.636500 51.281053,0.635928 51.281200,0.635680 51.281304,0.635648 51.281328,0.635471 51.281414,0.635355 51.281480,0.635248 51.281522,0.635165 51.281528,0.635126 51.281506,0.635120 51.281448,0.635170 51.281390,0.635305 51.281282,0.635452 51.281196,0.635592 51.281122,0.635906 51.280987,0.636053 51.280929,0.636210 51.280879,0.636396 51.280795,0.636758 51.280672,0.636920 51.280597,0.637129 51.280463,0.637169 51.280427,0.637220 51.280396,0.637447 51.280348,0.637617 51.280330,0.637754 51.280303,0.638076 51.280227,0.638458 51.280112,0.638774 51.279980,0.638909 51.279915,0.639129 51.279842)))
point: POINT (0.637109 51.280679)
notes: Maidstone Borough Council Tree Preservation Order No 17, 1986 under Section 60 of the Town and Country Planning Act 1971 dated 19th July 1986. Confirmed 8th October 1986
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.