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Changed Itinearies

 
Jeff Belisle
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Or make an assumption that changed itinearies always result in extra payments
 
Deepak Pant
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Document the assumption you are making and depict it in the sequence diagram.

So you could say that "Change Iti.." could lead to either REFUND or More Money. You could also state that in case of REFUND, some kind of airline credit would be given for future purchases.
 
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