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: ZZZZZWESRW895
name: Bucks. County Council (Eton Rural District) Tree Preservation Order No.1; 1955; dated 27/9/55 made u
tree-preservation-order: undefined
TPO/BCC/1955/01
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.554556 51.565422,-0.554886 51.564670,-0.555304 51.563771,-0.555636 51.563052,-0.556579 51.562688,-0.556453 51.562615,-0.556028 51.562773,-0.555694 51.562905,-0.554753 51.563232,-0.553925 51.563528,-0.553336 51.563718,-0.553155 51.563920,-0.552851 51.564276,-0.552721 51.564417,-0.552673 51.564496,-0.552612 51.564602,-0.552554 51.564767,-0.552534 51.564843,-0.552313 51.565836,-0.552281 51.565970,-0.552212 51.566131,-0.551798 51.566907,-0.551886 51.566934,-0.551994 51.566754,-0.552173 51.566439,-0.552256 51.566275,-0.552401 51.565958,-0.552439 51.565844,-0.552442 51.565796,-0.552489 51.565521,-0.552561 51.565226,-0.552627 51.564883,-0.552672 51.564734,-0.552697 51.564694,-0.552862 51.564519,-0.553191 51.564193,-0.553507 51.563872,-0.553526 51.563855,-0.553967 51.563694,-0.554995 51.563313,-0.555194 51.563242,-0.555329 51.563183,-0.555178 51.563556,-0.554874 51.564148,-0.554618 51.564614,-0.554431 51.565191,-0.554388 51.565346,-0.554402 51.565387,-0.554440 51.565413,-0.554499 51.565422,-0.554556 51.565422)))
point: POINT (-0.554201 51.564199)
notes
entry-date: 2017-07-04
start-date: 2017-07-04
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.