Which step took place in Switzerland?
Separate breeding, mother plant selection, propagation and distribution. Different operators and countries can be involved. Identify who was responsible for each relevant step and which records support the claim.
Trace the claim back to a batch
Start with the batch ID and ask for a record of the propagation site. Earlier records are needed to trace the source material. Where a mother plant is kept today does not establish its breeding or transfer history.
Example: locally propagated material
A batch can be propagated in Switzerland from a lineage sourced abroad. Record those facts separately so that anyone reading the file can tell which part of the supply chain each claim describes.