ConsumptionEvent should have object properties to reference Consumer, Account, PublicationPlatform, PublicationChannel and PublicationService

[JuergenGrupp]

A direct reference from the ConsumptionEvent to the Consumer and to the Account is missing. The same with the PublicationPlatform, PublicationChannel and PublicationService. Without it the ConsumptionEvent would be almost useless.

[JuergenGrupp]

Will add: ConsumptionEvent hasConsumer Consumer ConsumptionEvent accountingTo Account ConsumptionEvent occursOn PublicationPlatform ConsumptionEvent occursIn PublicationChannel ConsumptionEvent occursIn PublicationService