SysMLv1: MagicDraw/Cameo: If redisplay of an Association with an InformationFlow or ItemFlow creates a strange extra dashed arrow with «ItemFlow» keywords (separate from the Association) just remove (only) that extra dashed line from the diagram.

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far fa-sticky-note
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Note kind
DISPLAY
ISSUE
TOOL
Policy level
INFORMATIVE
UML keywords
InformationFlow
InformationFlow::conveyed
InformationFlow::realization
SysMLv1.x keywords
ItemFlow
SysML Block Definition Diagram
Keywords
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This one often causes confusion with new MagicDraw/Cameo SysML tool users.

If an Association already has an ItemFlow assigned and you re-display it in a BDD you may see a strange "extra" dashed arrow with the keyword «ItemFlow» and the name of the ItemFlow, as well as the Association line/arrow symbol itself.

It's not a bug. If you use Select In Containment Tree you'll see it carries info for the ItemFlow.

You can safely remove it from the BDD as it just causes clutter, but don't delete it from the underlying model!

Make sure when the Question dialog pops up to select No!

It will then just show the Association line/arrow itself, along with the 'conveyed' Classifier of the ItemFlow.

The "extra" dashed arrow notation for ItemFlow used in Magic Cyber-Systems Engineer® (Cameo Systems Modeler®) is adapted from the notation for InformationFlow in UML2.5.1: 'An InformationFlow is represented using the same notation as Dependency, with the keyword «flow» adorning its dashed line.' It isn't "official" SysMLv1 – it doesn't appear in any SysMLv1 Figure examples or notation Tables – but it does no harm (it's actually quite interesting to inspect as the Cameo implementation carries additional information specific to ItemFlow).

Visit also:
SysMLv1: MagicDraw/Cameo: Synchronising ItemFlows on Connectors with ObjectFlows in Activities using the Item Flow Manager. Nice!
SysMLv1: MagicDraw/Cameo: HOWTO show "missing" ItemFlows after using Display Related Elements to re-draw Associations and Connectors. Use the 'Show Realised Item Flows' and 'Realize All Item Flows' smart manipulators.
Relates to
Related notes
[TOOL] In MagicDraw SysML or Cameo Systems Modeler if you drag a Classifier onto an Association or Connector, it will in fact create a SysML ItemFlow not a UML InformationFlow
[ISSUE, TOOL] MagicDraw/Cameo 19SP3: Can't callout from ItemFlow on Connector, the Note handle pulls from the Connector not the ItemFlow
[TIP, TOOL] MagicDraw/Cameo: HOWTO get back an InformationFlow or ItemFlow when it vanishes from a redrawn Connector. Use the 'Show Realised Item Flows' and 'Realize All Item Flows' smart manipulators!
[ISSUE, TIP, TOOL] MagicDraw/Cameo: HOWTO redisplay the name and type of a SysML ItemFlow on a Connector if it vanishes (such as when the Connector is redrawn)
[DISPLAY, NAMING, WARNING] The UML InformationFlow notation and the SysML ItemFlow notation can sometimes clash with the notation of named Associations and named and typed Connectors
Related notes (backlinks)
Related snippets (extracts)
  [SysML-1.6] An ItemFlow describes the flow of items across a connector or an association. It may constrain the item exchange between blocks, block usages, or ports as specified by their flow properties.
  [SysML-1.6] An ItemFlow describes the flow of items across a connector or an association. The notation of an item flow is a black arrowhead on the connector or association. The arrowhead is towards the target element.
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