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: TPO456
name: 2/1970
tree-preservation-order: undefined
2/1970
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.641929 51.265117,0.641836 51.265029,0.641699 51.264928,0.641195 51.264615,0.641003 51.264486,0.640871 51.264389,0.640754 51.264288,0.640542 51.264125,0.640087 51.263720,0.639776 51.263428,0.639649 51.263337,0.639302 51.263064,0.639141 51.262967,0.639119 51.262928,0.639122 51.262896,0.639137 51.262858,0.639181 51.262824,0.639321 51.262755,0.640900 51.264072,0.641044 51.264201,0.641220 51.264337,0.641541 51.264628,0.641640 51.264730,0.642067 51.265090,0.642185 51.265151,0.642290 51.265225,0.642404 51.265367,0.642311 51.265425,0.642133 51.265342,0.642048 51.265292,0.641929 51.265117)))
point: POINT (0.640606 51.263983)
notes: County of Kent (Hollingbourne Rural District) Tree Preservation Order No. 2 of 1970 under Section 29 of the Town and Country Planning Act 1962 Woodlands - W1 Mixed Conifers and Deciduous
organisation
entry-date: 1970-05-28
start-date: 1970-03-19
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.