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: TPO983
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.660743 51.259193,0.657429 51.259928,0.657368 51.259870,0.658651 51.259553,0.659797 51.259306,0.660641 51.259105,0.661211 51.258984,0.661822 51.258785,0.662384 51.258613,0.663006 51.258434,0.663046 51.258387,0.663500 51.258227,0.664307 51.258008,0.664371 51.258016,0.664990 51.257845,0.664987 51.257788,0.665176 51.257742,0.665526 51.257639,0.665672 51.257577,0.665771 51.257620,0.666178 51.257481,0.666214 51.257476,0.666241 51.257482,0.666258 51.257489,0.666264 51.257505,0.666210 51.257554,0.666195 51.257582,0.665717 51.257746,0.664993 51.257951,0.664171 51.258155,0.663632 51.258316,0.662733 51.258633,0.661692 51.258972,0.661257 51.259087,0.660743 51.259193)))
point: POINT (0.662104 51.258705)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W11 mixed Deciduous and Conifer
organisation
entry-date: 1990-10-05
start-date: 1990-10-02
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.