Tree

There is a problem

1000 entries with tree-protection-order field must match the reference field in the tree protection order

reference: 34/TAN T1
name: Land at Kenley Aerodrome
tree-preservation-order: undefined
34/TAN
uprn
address-text: Land at Kenley Aerodrome
point: POINT (-0.090000 51.302550)
geometry: MULTIPOLYGON (((-0.090820 51.303929,-0.090819 51.303940,-0.091220 51.303396,-0.090983 51.303201,-0.091021 51.302964,-0.091040 51.302501,-0.091027 51.302126,-0.089714 51.302098,-0.089736 51.302021,-0.090002 51.302002,-0.090483 51.302028,-0.090581 51.301940,-0.091003 51.302019,-0.091112 51.301663,-0.090768 51.301289,-0.090253 51.300495,-0.089875 51.300496,-0.089871 51.300608,-0.089699 51.300641,-0.089668 51.300706,-0.089627 51.301923,-0.089473 51.301980,-0.089479 51.302057,-0.089149 51.302046,-0.088819 51.302249,-0.088877 51.302446,-0.088882 51.302767,-0.088827 51.302951,-0.088445 51.303521,-0.088613 51.303572,-0.088683 51.303697,-0.088898 51.303743,-0.089171 51.303789,-0.089176 51.303890,-0.089741 51.303953,-0.090820 51.303929)))
notes
organisation
felled-date
entry-date: 1975-12-01
start-date: 1975-12-01
end-date

Your dataset is missing the tree-preservation-order column.

The Tree guidance explains how to fix the issue:

The reference for the tree preservation order that affects this tree.

Example: TPO1