Entity Framework Core - Knowledge Base (KB)

Issue loading child entity of a parent entity. Unidirectional mapping and 1 to 0..1 relationship with a Shared primary Key?

When I try to load child entity of parent entity it loads with default values. If i try to load explicitly it throws exception ...Multiplicity constraint violated.... The role 'Association_Customer_Target' of the relationship 'CodeFirstNamespace.Associati...