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Creating and updating aggregates

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By default, all instances of singleton entities are included and no instances of multiton entities are included. The StoreInstances parameter is used to define which multiton instances are stored in the aggregate. The unique Id of the created aggregate will be saved in a selected attribute. This Id can then be used in other services to Read, Update or Delete the aggregate.

If the attribute selected for the AggregateId is not part of a singleton then the target instance parameter can be used to select the instance on which the aggregate Id must be stored. If the target instance has no value, then it is assumed that the selected attribute either belongs to a singleton entity, or that there is an active instance present. If not, an error is thrown. The target instance must be single valued.

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