LDM user field as Reference ID

To User LDM fields with the Keep value = true property, the UI property ‘ExternalKeyField=1’ can now be added. This has the effect that when copying a record, e.g. an article, the value of this field is not copied. In addition, a Field Validation is created on this field: Must be unique or empty.

This allows this field to be used as a key field for external applications.