Tree preservation zone

There is a problem

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

reference: TPO216
name: Kingsforth Hall
tree-preservation-order: undefined
Elsham 1972
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-0.448475 53.661662,-0.449680 53.661666,-0.450077 53.660752,-0.450231 53.660436,-0.450435 53.659924,-0.450650 53.659332,-0.450797 53.658959,-0.450971 53.658614,-0.449706 53.658529,-0.448693 53.658475,-0.445652 53.658265,-0.445584 53.658008,-0.445542 53.657919,-0.445483 53.657847,-0.445409 53.657789,-0.445290 53.657728,-0.445218 53.657707,-0.445101 53.657682,-0.444795 53.657642,-0.444259 53.657616,-0.443832 53.657637,-0.443359 53.657704,-0.443248 53.657726,-0.443291 53.657809,-0.443341 53.657864,-0.443541 53.658029,-0.443704 53.658137,-0.443699 53.658326,-0.443709 53.658588,-0.443712 53.660736,-0.443997 53.660729,-0.443999 53.660768,-0.444087 53.660868,-0.444110 53.661705,-0.445967 53.661655,-0.446011 53.661679,-0.446099 53.661698,-0.448031 53.661655,-0.448475 53.661662)))
point: POINT (-0.44688 53.659847)
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.