Tree preservation zone

There is a problem

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

reference: TPO180.A1
name: Within the site of Holly Mount, Mill Lane.
tree-preservation-order: undefined
TPO180
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-2.911589 53.429721,-2.911499 53.429887,-2.911564 53.429905,-2.911956 53.430049,-2.912070 53.430097,-2.912122 53.430116,-2.912151 53.430123,-2.912224 53.430097,-2.912282 53.430079,-2.912386 53.430101,-2.912634 53.430203,-2.912679 53.430220,-2.912749 53.430156,-2.912947 53.429982,-2.913034 53.429902,-2.913048 53.429891,-2.913078 53.429856,-2.913094 53.429831,-2.913115 53.429788,-2.913119 53.429776,-2.913119 53.429767,-2.913122 53.429759,-2.913122 53.429751,-2.913119 53.429746,-2.913118 53.429740,-2.913111 53.429730,-2.913101 53.429720,-2.912708 53.429480,-2.912602 53.429413,-2.912155 53.429137,-2.912059 53.429205,-2.912054 53.429213,-2.912053 53.429219,-2.912076 53.429235,-2.912007 53.429287,-2.911999 53.429291,-2.911974 53.429284,-2.911962 53.429284,-2.911950 53.429288,-2.911835 53.429386,-2.911749 53.429479,-2.911661 53.429597,-2.911597 53.429699,-2.911589 53.429721)))
point: POINT (-2.912307 53.429723)
notes: The several tree of whatever species situated within area A1 on map.
entry-date: 1979-11-23
start-date: 1980-02-04
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.