Tree preservation zone

There is a problem

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

reference: 6/TAN W1
name: Area between Slines Oak Road and Barnard Road
tree-preservation-order: undefined
6/TAN
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((-0.028414 51.302750,-0.028413 51.302773,-0.028637 51.302424,-0.028838 51.302154,-0.029085 51.301903,-0.029349 51.301474,-0.029436 51.301227,-0.029526 51.300872,-0.029411 51.300473,-0.030159 51.300177,-0.029823 51.299945,-0.029027 51.299490,-0.028972 51.299505,-0.028870 51.299601,-0.028832 51.299624,-0.028748 51.299629,-0.028689 51.299615,-0.028652 51.299574,-0.028564 51.299515,-0.028359 51.299529,-0.028242 51.299519,-0.027996 51.299445,-0.027830 51.299371,-0.027652 51.299392,-0.027406 51.299323,-0.026919 51.299327,-0.026412 51.299380,-0.024417 51.299437,-0.023955 51.299493,-0.026362 51.300491,-0.026493 51.300365,-0.026923 51.300004,-0.027392 51.299589,-0.027909 51.299964,-0.028033 51.300046,-0.028260 51.300214,-0.027443 51.300943,-0.027517 51.301023,-0.027702 51.301152,-0.027799 51.301308,-0.028414 51.302750)))
point: POINT (-0.027784 51.300447)
notes
organisation
entry-date: 1975-01-02
start-date: 1975-01-02
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.