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: 1/83/17-757
name: 81 Individual, 18 Groups
tree-preservation-order: undefined
1/83/17-757
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.213130 52.033097,0.213149 52.033104,0.213160 52.033114,0.213165 52.033137,0.213161 52.033191,0.213144 52.033253,0.213121 52.033291,0.213076 52.033337,0.213028 52.033364,0.212982 52.033385,0.212915 52.033411,0.212837 52.033433,0.212793 52.033444,0.212734 52.033446,0.212716 52.033441,0.212704 52.033432,0.212703 52.033420,0.212707 52.033399,0.212722 52.033379,0.212732 52.033370,0.212757 52.033355,0.212907 52.033320,0.212940 52.033308,0.212957 52.033297,0.212969 52.033279,0.212978 52.033259,0.212998 52.033239,0.213014 52.033219,0.213024 52.033203,0.213032 52.033186,0.213035 52.033169,0.213032 52.033132,0.213040 52.033109,0.213071 52.033095,0.213103 52.033093,0.213130 52.033097)))
point: POINT (0.212978 52.033291)
notes
entry-date: 1984-02-14
start-date: 1984-02-14
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.