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: ZZZZZRESRW909
name: Eton Rural District Council (Fulmer) Interim Preservation Order No.2; 1947; dated 31/12/47 affecting
tree-preservation-order: undefined
TPO/ER/1947/02
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.557979 51.563201,-0.557921 51.563202,-0.557871 51.563216,-0.557877 51.563261,-0.557936 51.563307,-0.558006 51.563333,-0.558124 51.563361,-0.558189 51.563395,-0.557870 51.563584,-0.557515 51.563817,-0.557353 51.563938,-0.557222 51.564011,-0.557143 51.564148,-0.557069 51.564251,-0.557008 51.564291,-0.557008 51.564334,-0.556999 51.564351,-0.556896 51.564415,-0.556843 51.564483,-0.556807 51.564488,-0.556791 51.564500,-0.556776 51.564561,-0.556783 51.564649,-0.556768 51.564666,-0.556723 51.564692,-0.556710 51.564747,-0.556655 51.564777,-0.556643 51.564791,-0.556598 51.564858,-0.556596 51.564884,-0.556603 51.564893,-0.556687 51.564929,-0.556753 51.564945,-0.556856 51.564932,-0.556907 51.564906,-0.557134 51.564550,-0.557168 51.564484,-0.557212 51.564279,-0.557517 51.563937,-0.557553 51.563909,-0.557631 51.563855,-0.557843 51.563747,-0.558317 51.563541,-0.558546 51.563429,-0.558887 51.563199,-0.559021 51.563091,-0.558896 51.563030,-0.558801 51.563011,-0.558688 51.563008,-0.558608 51.563179,-0.558595 51.563183,-0.558490 51.563186,-0.558180 51.563229,-0.558104 51.563224,-0.557979 51.563201)))
point: POINT (-0.557738 51.563861)
notes
organisation
entry-date: 2017-07-04
start-date: 2017-07-04
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.