Changes
== External Reference ==
An external Reference is a link to a Proxy instance via property values. If the MetaProxyProperty ProxyMetaProperty has a defined Reference it is defined as an External Reference. The Proxy will refer automatically to the instance of the targeted MetaProxy having the same entry in its external Primary Key Property than the given Proxy instance.
{{Hint|When using external keys and external references it does not matter which object is created first (master or child), the linkage will be done!}}
{{Attention|Only one External Primary Key Property is supported for one MetaProxy object}}
