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Message direction in communication diagram

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I am learning the basics of using communication diagrams and I struggle to understand how to change the direction of my messages-arrows? I create a link between to lifelines but the no matter how i initiate the link the message direction is the same.

How to change the source and target of a message in a communication diagram?

Thanks!

Product: Astah Professional

Add predecessor on communication diagram

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Hi,

I want to add predecessor on communication diagram butit shows me always << Unspecified >>. How to add predecessor on communication diagram please ?

Product: Astah Professional

Page: 1