Tree preservation zone

There is a problem

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

reference: ZZZZDUESXE141
name: The Chiltern District Council (Land at Maltmans Green School, Maltmans Lane, Chalfont St Peter) Tree
tree-preservation-order: undefined
TPO/1994/011
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.565702 51.597072,-0.565245 51.597063,-0.565224 51.597527,-0.565218 51.597627,-0.565222 51.597680,-0.565211 51.597715,-0.565199 51.597774,-0.565218 51.597864,-0.565217 51.597905,-0.565219 51.598005,-0.565228 51.598314,-0.565231 51.598340,-0.565241 51.598379,-0.565253 51.598441,-0.565258 51.598491,-0.567283 51.598366,-0.567371 51.598327,-0.569581 51.597168,-0.569584 51.597164,-0.569579 51.597142,-0.569408 51.597179,-0.569386 51.597185,-0.569368 51.597187,-0.569093 51.597195,-0.569010 51.597195,-0.569003 51.597193,-0.568573 51.596966,-0.568158 51.596743,-0.568120 51.596726,-0.568103 51.596726,-0.567966 51.596766,-0.567810 51.596807,-0.567277 51.596942,-0.567127 51.596974,-0.567045 51.596987,-0.566832 51.597010,-0.566766 51.597020,-0.566488 51.597052,-0.566328 51.597064,-0.566014 51.597066,-0.565912 51.597070,-0.565702 51.597072)))
point: POINT (-0.566951 51.597615)
notes
entry-date: 2010-02-18
start-date: 2010-02-18
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.