Default configuration is delivered for the way in which linkages are validated. This is by object type and by linkage type. The default configuration is the following:
As can be seen, the default validation methods are delivered as default for batch jobs only. You can over-ride these defaults with your own settings as per your requirements. There are really only two settings here – either the linkages of that particular type are validated during the playback or they are done after the playback.
Batch jobs are the most common scenario that requires validation of linkage types after the playback rather than during it.