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: TPO959
name: 3/1980
tree-preservation-order: undefined
3/1980
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.714846 51.253771,0.714776 51.253763,0.714708 51.253721,0.714683 51.253674,0.714537 51.253556,0.714431 51.253456,0.714338 51.253346,0.714575 51.253268,0.715357 51.253077,0.715515 51.253022,0.715682 51.252952,0.716619 51.252641,0.716246 51.252242,0.715763 51.251829,0.714485 51.250788,0.714187 51.250456,0.715207 51.250184,0.718065 51.252622,0.718029 51.252639,0.717871 51.252661,0.717780 51.252665,0.717516 51.252709,0.716903 51.252830,0.716237 51.252986,0.715859 51.253096,0.715598 51.253233,0.715315 51.253463,0.715255 51.253499,0.714967 51.253711,0.714846 51.253771)))
point: POINT (0.715965 51.251832)
notes: The Maidstone Borough Council Tree Preservation Order No 3 of 1980 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W2 comprising the several
organisation
entry-date: 1980-01-04
start-date: 1980-01-04
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.