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: ZZZZZRESRW929
name: Bucks. Country Council (Eton Rural District) Tree Preservation Order No.7; 1949; dated 30/6/49 made
tree-preservation-order: undefined
TPO/BCC/1949/07
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.645296 51.541016,-0.645359 51.540905,-0.646151 51.541005,-0.646213 51.540924,-0.646223 51.540880,-0.646201 51.540809,-0.646030 51.540548,-0.646012 51.540532,-0.645967 51.540516,-0.645295 51.540574,-0.645290 51.540551,-0.645084 51.540520,-0.644869 51.540476,-0.644296 51.540297,-0.644073 51.540236,-0.643892 51.540208,-0.642909 51.540249,-0.642841 51.540227,-0.642802 51.540178,-0.642770 51.540177,-0.642602 51.540238,-0.642599 51.540245,-0.642609 51.540286,-0.642627 51.540315,-0.642649 51.540446,-0.642864 51.540660,-0.642929 51.540750,-0.643069 51.540736,-0.643130 51.540738,-0.643203 51.540752,-0.643301 51.540784,-0.643403 51.540790,-0.643653 51.540746,-0.643677 51.540699,-0.643720 51.540678,-0.643976 51.540706,-0.645102 51.540929,-0.645296 51.541016)))
point: POINT (-0.644344 51.540587)
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.