Tree preservation zone

There is a problem

tree-preservation-order column must match the reference field in the tree preservation order dataset

reference: TPO243
name: Plot 8a
tree-preservation-order: undefined
Elsham 1972
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((-0.419721 53.606930,-0.419714 53.606894,-0.419697 53.606884,-0.419646 53.606883,-0.419585 53.606892,-0.419584 53.606913,-0.419574 53.606974,-0.419571 53.607040,-0.419000 53.606986,-0.418984 53.606951,-0.418985 53.606925,-0.418961 53.606894,-0.418962 53.606859,-0.418931 53.606777,-0.418863 53.606750,-0.418822 53.606725,-0.418779 53.606724,-0.418711 53.606718,-0.418626 53.606702,-0.418506 53.606715,-0.418435 53.606760,-0.418382 53.606815,-0.418329 53.606866,-0.418292 53.606926,-0.418264 53.607012,-0.419586 53.607101,-0.419629 53.607101,-0.419672 53.607097,-0.419689 53.607082,-0.419699 53.607062,-0.419719 53.606975,-0.419721 53.606930)))
point: POINT (-0.418855 53.606926)
notes
entry-date: 1972-11-03
start-date: 1972-09-07
end-date

Your data is missing a tree-preservation-order.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.