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: 1/80/02-305
name: 41 Individual 6 Groups
tree-preservation-order: undefined
1/80/02-305
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.302993 52.048273,0.303020 52.048277,0.303086 52.048303,0.303164 52.048339,0.303324 52.048423,0.303393 52.048466,0.303476 52.048533,0.303489 52.048545,0.303523 52.048578,0.303541 52.048603,0.303544 52.048611,0.303546 52.048635,0.303540 52.048667,0.303528 52.048693,0.303514 52.048708,0.303497 52.048722,0.303456 52.048752,0.303394 52.048787,0.303234 52.048884,0.303207 52.048890,0.303196 52.048884,0.303193 52.048880,0.303191 52.048873,0.303175 52.048734,0.303171 52.048686,0.303152 52.048587,0.303120 52.048492,0.303084 52.048430,0.302993 52.048322,0.302969 52.048288,0.302970 52.048280,0.302977 52.048273,0.302993 52.048273)))
point: POINT (0.303281 52.048586)
notes
entry-date: 1980-04-15
start-date: 1980-04-15
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.