Multiplicitetskonflikter med referensbegränsningen i Role X i relationen Y. Eftersom en/alla egenskaper i Dependent Role inte kan ha värdet null måste multipliciteten för Principal Role vara 1.

Multiplicity conflicts with the referential constraint in Role 'X' in relationship 'Y'. Because one/all of the properties in the Dependent Role is non-nullable, multiplicity of the Principal Role must be '1'.