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: 1/08/62-135
name: Oak Trees
tree-preservation-order: undefined
1/08/62-135
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.279394 51.869033,0.278884 51.869037,0.278876 51.869036,0.278809 51.869017,0.278794 51.869010,0.278754 51.868980,0.278749 51.868973,0.278736 51.868936,0.278736 51.868927,0.278718 51.868784,0.278720 51.868775,0.278728 51.868766,0.278739 51.868760,0.278761 51.868756,0.278904 51.868754,0.278912 51.868755,0.278925 51.868760,0.278934 51.868766,0.278940 51.868776,0.278945 51.868879,0.279375 51.868868,0.279398 51.868871,0.279413 51.868879,0.279420 51.868889,0.279436 51.869011,0.279434 51.869016,0.279425 51.869025,0.279411 51.869031,0.279403 51.869033,0.279394 51.869033),(0.278823 51.868923,0.278823 51.868928,0.278832 51.868953,0.278855 51.868971,0.278898 51.868983,0.279345 51.868980,0.279338 51.868923,0.278939 51.868934,0.278925 51.868937,0.278911 51.868937,0.278900 51.868935,0.278886 51.868929,0.278867 51.868914,0.278860 51.868904,0.278855 51.868809,0.278809 51.868809,0.278823 51.868923)))
point: POINT (0.279039 51.868922)
notes
entry-date: 2008-04-02
start-date: 2008-04-02
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.