Tree preservation zone

There is a problem

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

reference: 90/00521/C
name: Oakes House, Stainland Road, Holywell Green
tree-preservation-order: undefined
90/00521/C
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-1.869875 53.674971,-1.869171 53.675049,-1.869111 53.675041,-1.869082 53.675027,-1.868893 53.674708,-1.868910 53.674696,-1.869049 53.674721,-1.869125 53.674708,-1.869150 53.674696,-1.869176 53.674669,-1.869189 53.674617,-1.869174 53.674576,-1.869145 53.674542,-1.869009 53.674428,-1.868999 53.674409,-1.868986 53.674440,-1.869012 53.674607,-1.868827 53.674601,-1.868739 53.674606,-1.868743 53.674635,-1.868763 53.674654,-1.869028 53.675113,-1.870027 53.675019,-1.869785 53.674050,-1.869045 53.674215,-1.868993 53.674252,-1.869062 53.674393,-1.869138 53.674336,-1.869262 53.674273,-1.869504 53.674207,-1.869663 53.674176,-1.869741 53.674178,-1.869778 53.674344,-1.869804 53.674510,-1.869903 53.674937,-1.869902 53.674952,-1.869875 53.674971)),((-1.869343 53.674613,-1.869353 53.674622,-1.869373 53.674615,-1.869361 53.674604,-1.869343 53.674613)),((-1.869268 53.674371,-1.869283 53.674380,-1.869298 53.674369,-1.869278 53.674362,-1.869268 53.674371)))
point: POINT (-1.869398 53.6746)
notes: Elm, beech, horse chesnut, sycamore, lime, ash, cherry, oak, rowan
entry-date: 1990-07-19
start-date: 1990-07-19
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.