Following statement summarize the relationship of entities within a DDP package:
• A [Client] can have zero, one or many [Package](s), but only one at any point-in-time.
• A [Package] is for one specific [Client].
• A [Package] has one or many [Form Received].
• A [Form Received] belongs to one specific [Package].
• Both [Package] and [Form Received] can have zero, one or many [Attachment](s).
• An [Attachment] belongs to one specific [Form Received] or [Package].
• All [Package], [Form Received] and [Attachment] can have zero, one or many [Communication](s).
• A [Communication] can be created for a specific [Attachment], [Form Received] or [Package].
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