For a deeper look into our World Check One API, look into:
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Hello @Fran Dugger,
just to clarify I believe in WC1 there is no CaseReferenceID field but there is CaseId.
CaseId is group specific identifier. It have to be unique in the group.
CaseSystemId is system specific identifier. It is generated by WC1 system and it's unique in all groups.