SysML ItemFlow on an Association

The main reason to use a SysML ItemFlow on an Association is to indicate compatability with FlowProperty items on the associated blocks:
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The example happens to use ValueTypes as the conveyed Classifiers. The ItemFlow on the Association uses Water, which is compatible with type Liquid of each the FlowProperty defined on the Associated blocks.

Note that:

The main power of ItemFlow comes when one indeed uses an itemProperty as shown next

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