Property talk:P12

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Symmetric property⧼colon⧽items linked with this property by [item A] should also have this property with [item A] as value
Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P12#Symmetric
Qualifiers start date (P87), end date (P88)⧼colon⧽this property should be used only with listed qualifiers
Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P12#Qualifiers