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: ZZZZZWESRW769
name: Bucks. County Council (Eton Rural District) Tree Preservation Order No.11 - 1952; dated 17/11/52; ma
tree-preservation-order: undefined
TPO/BCC/1952/11
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.692376 51.535442,-0.692054 51.535990,-0.691937 51.536210,-0.691887 51.536403,-0.691867 51.536529,-0.691813 51.536969,-0.691834 51.536969,-0.691813 51.537089,-0.691769 51.537280,-0.691678 51.537586,-0.691582 51.537812,-0.691460 51.538016,-0.691216 51.538312,-0.693010 51.538298,-0.693148 51.538278,-0.693244 51.538251,-0.693272 51.538291,-0.693551 51.538280,-0.693589 51.538274,-0.693608 51.538263,-0.693766 51.538131,-0.693866 51.538100,-0.693947 51.538087,-0.694183 51.538080,-0.694356 51.538092,-0.694775 51.538023,-0.695262 51.535940,-0.695425 51.535104,-0.695926 51.534041,-0.696226 51.533007,-0.695970 51.531964,-0.696261 51.530967,-0.695771 51.531028,-0.695498 51.530947,-0.694038 51.531112,-0.692874 51.531312,-0.693325 51.532866,-0.693343 51.533232,-0.693337 51.533582,-0.693310 51.533760,-0.693218 51.534032,-0.692815 51.534751,-0.692618 51.535042,-0.692548 51.535104,-0.692526 51.535142,-0.692517 51.535199,-0.692376 51.535442)))
point: POINT (-0.694055 51.534728)
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.