Cascade issue when deleting an entity in a one-to-one relationship using Fluent NHibernate?

I think your mapping isn't quite right. If you take a look at the NH documentation their example of using one-to-one for a parent-child relationship involves a many-to-one mapping (with unique=true) and a one-to-one mapping, not a pair of one-to-one mappings. (A pair of one-to-one mappings is for the case where two tables are associated using a shared PK).

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