Multiplicitetskonflikter med referensbegränsningen i Role X i relationen Y. Eftersom egenskaperna i Dependent Role inte kan vara null måste multipliciteten för Principal Role vara 1.
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English version
Multiplicity conflicts with the referential constraint in Role 'X' in relationship 'Y'. Because all of the properties in the Dependent Role are non-nullable, multiplicity of the Principal Role must be '1'.