Tree preservation zone

There is a problem

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

reference: TPO308
name: Saxby Hall
tree-preservation-order: undefined
Saxby all Saints 1954
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-0.504699 53.636548,-0.504844 53.636346,-0.504795 53.636326,-0.504442 53.636227,-0.504185 53.636185,-0.504082 53.636186,-0.503991 53.636168,-0.503874 53.636080,-0.503773 53.635987,-0.503673 53.635878,-0.503636 53.635825,-0.503585 53.635704,-0.503566 53.635639,-0.503555 53.635565,-0.503564 53.635549,-0.503564 53.635478,-0.503571 53.635461,-0.503578 53.635449,-0.503621 53.635442,-0.503637 53.635410,-0.503695 53.635336,-0.503847 53.635190,-0.503963 53.635114,-0.503583 53.634919,-0.502955 53.635148,-0.502728 53.635215,-0.502207 53.635341,-0.502303 53.635451,-0.502260 53.635463,-0.502200 53.635494,-0.502016 53.635550,-0.502360 53.635985,-0.502421 53.636096,-0.502447 53.636089,-0.502543 53.636251,-0.502984 53.636287,-0.503015 53.636310,-0.503137 53.636356,-0.503404 53.636391,-0.503478 53.636414,-0.503508 53.636431,-0.503730 53.636394,-0.503817 53.636328,-0.503853 53.636316,-0.503878 53.636319,-0.504542 53.636498,-0.504699 53.636548)))
point: POINT (-0.503202 53.635772)
notes
organisation
entry-date: 1963-06-03
start-date: 1954-06-30
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.