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: TPO41
name: 4/1978
tree-preservation-order: undefined
4/1978
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.576480 51.298741,0.576533 51.298764,0.576641 51.298789,0.576814 51.298807,0.577340 51.298798,0.577623 51.298784,0.577801 51.298795,0.577874 51.298820,0.578039 51.298907,0.578135 51.298995,0.577849 51.299092,0.577813 51.299119,0.577800 51.299154,0.577294 51.299283,0.574944 51.298977,0.574623 51.298831,0.574566 51.298798,0.574476 51.298728,0.574426 51.298650,0.574456 51.298627,0.574464 51.298599,0.574477 51.298584,0.574505 51.298568,0.574573 51.298555,0.574623 51.298569,0.574660 51.298546,0.574786 51.298589,0.574923 51.298682,0.574977 51.298738,0.575083 51.298749,0.575137 51.298779,0.575190 51.298781,0.575233 51.298619,0.576237 51.298554,0.576325 51.298602,0.576480 51.298741)))
point: POINT (0.576315 51.298906)
notes: Maidstone Borough Council Tree Preservation Order No. 4 of 1978 under Section 60 of the Town and Country Planning Act 1971. Woodlands - W2 Comprising a mixed woodland
organisation
entry-date: 1978-08-04
start-date: 1978-08-04
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.