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: 89/00452/C/2
name: Deer Play House, Dean Lane Triangle
tree-preservation-order: undefined
89/00452/C
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-1.939831 53.690576,-1.939784 53.690545,-1.939718 53.690579,-1.939706 53.690567,-1.939207 53.690851,-1.939061 53.690744,-1.939022 53.690731,-1.939178 53.690873,-1.939343 53.690996,-1.939398 53.691033,-1.939470 53.691063,-1.940057 53.691092,-1.940699 53.691206,-1.940458 53.690840,-1.940339 53.690854,-1.940227 53.690885,-1.939877 53.690548,-1.939831 53.690576)),((-1.938952 53.690655,-1.939120 53.690565,-1.939162 53.690555,-1.939273 53.690549,-1.939397 53.690463,-1.939250 53.690398,-1.938909 53.690648,-1.938932 53.690657,-1.938952 53.690655)),((-1.939118 53.690632,-1.939131 53.690641,-1.939149 53.690632,-1.939139 53.690623,-1.939118 53.690632)),((-1.939073 53.690650,-1.939091 53.690659,-1.939103 53.690648,-1.939083 53.690641,-1.939073 53.690650)),((-1.939027 53.690677,-1.939040 53.690686,-1.939058 53.690677,-1.939048 53.690668,-1.939027 53.690677)),((-1.938997 53.690704,-1.939015 53.690713,-1.939027 53.690702,-1.939007 53.690695,-1.938997 53.690704)))
point: POINT (-1.939843 53.690871)
notes: Beech, lime, oak, sycamore, horse chesnut
entry-date: 1990-01-19
start-date: 1990-01-19
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.