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: TPO781
name: 15/1986
tree-preservation-order: undefined
15/1986
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.676965 51.263353,0.677071 51.263571,0.675768 51.263803,0.675427 51.263838,0.674808 51.263273,0.674887 51.263256,0.675051 51.263265,0.675357 51.263257,0.675411 51.263247,0.675941 51.262995,0.675972 51.262952,0.676001 51.262884,0.676040 51.262740,0.676792 51.262420,0.676949 51.262499,0.677072 51.262602,0.677093 51.262644,0.677133 51.262779,0.677173 51.262876,0.677171 51.262890,0.677143 51.262930,0.677152 51.262995,0.677121 51.263030,0.677091 51.263044,0.676913 51.263043,0.676886 51.263055,0.676868 51.263076,0.676931 51.263225,0.676965 51.263353)))
point: POINT (0.676206 51.26322)
notes: Maidstone Borough Council Tree Preservation Order No 15, 1986 under Section 60 of the Town and Country Planning Act 1971 dated 18th July 1986. Confirmed 8th October 1986
organisation
entry-date: 1986-08-13
start-date: 1986-10-08
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.