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: ZZZZZWESRW953
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 (((-0.566055 51.542695,-0.566186 51.542712,-0.566449 51.542762,-0.566948 51.542826,-0.566980 51.542737,-0.567509 51.542916,-0.569046 51.543395,-0.569235 51.543106,-0.569387 51.542844,-0.569554 51.542662,-0.569616 51.542579,-0.569739 51.542389,-0.569811 51.542252,-0.569781 51.542245,-0.569454 51.542286,-0.569098 51.542263,-0.568071 51.542171,-0.567311 51.542059,-0.567407 51.541860,-0.567544 51.541537,-0.567989 51.540613,-0.568231 51.540039,-0.567493 51.539999,-0.566866 51.539952,-0.565104 51.538441,-0.565035 51.538610,-0.564971 51.538877,-0.564878 51.539134,-0.564612 51.539643,-0.564306 51.540114,-0.564085 51.540519,-0.563697 51.541522,-0.563535 51.541985,-0.563461 51.542140,-0.564814 51.542448,-0.565461 51.542584,-0.566055 51.542695)))
point: POINT (-0.566192 51.541236)
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.