Tree preservation zone

There is a problem

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

reference: TPO233
name: Burnham Beeches House
tree-preservation-order: undefined
Elsham 1972
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-0.423670 53.637327,-0.424101 53.637382,-0.424315 53.637361,-0.424386 53.637346,-0.424460 53.637343,-0.424763 53.637290,-0.424823 53.637267,-0.424899 53.637188,-0.424912 53.637138,-0.424952 53.637058,-0.425060 53.637040,-0.425000 53.636976,-0.424906 53.636896,-0.424785 53.636866,-0.424660 53.636877,-0.424392 53.636963,-0.424355 53.637015,-0.424283 53.637151,-0.423864 53.637211,-0.423682 53.637080,-0.423520 53.636931,-0.423613 53.636801,-0.423749 53.636703,-0.423770 53.636619,-0.423782 53.636525,-0.423749 53.636456,-0.423499 53.636391,-0.423435 53.636437,-0.423274 53.636452,-0.423274 53.636405,-0.423197 53.636423,-0.423174 53.636445,-0.423139 53.636520,-0.423129 53.636614,-0.423160 53.636748,-0.423169 53.636848,-0.423301 53.637174,-0.423320 53.637196,-0.423371 53.637291,-0.423644 53.637232,-0.423665 53.637257,-0.423646 53.637315,-0.423670 53.637327)))
point: POINT (-0.423916 53.636969)
notes
organisation
entry-date: 1972-11-03
start-date: 1972-09-07
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.