Crash Course 12.9.4 shift.setAssigned is undefined

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i have followed the Crash Course : Extending your business logic (use java action) and i have a problem at 12.9.4 i copy all the snipet from learning path but in my eclipse show me “The method setAssigned(boolean) is undefined for the type Shift” error like below         i suppose that i can add a Assigned attribute to shift entity in studio pro but why learning path doesn’t instruct that?    
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