Error(s) in microflow expression - LearnNow Training Management

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Hi all,   I am following the LearnNow Training Management course. In lecture 7.7.1 (Retrieving Your Data), the error ‘’Invalid argument types (Data and Time). Function ‘addDays expects argument types (Date and time, Integer/Long)’’ still occurs, even after placing the Course object before the Change object activity (Otherwise it won’t be in scope for the microflow expression in the Change object activity).  Is there someone who can help me in resolving this issue?   Thanks in advance.           
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3 answers
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The duration is probably of type string, instead of Decimal as it should be

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You made an error in the domain model. You have set the type of Course/Duration to DateTime but it is supposed to be an integer.

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 for me it doesnt work such solution

i dont know what i am doing wrong, have the rigth type of variable,

but it still doesnt work:

 

addDays($TrainingEvent/StartDate, $Course/Duration)

 

(uknown variable, perhaps the variabe is not in the scope)

in the error message there is :

element: chane object activity 'Change 'TrainingEvent" (EndDate)'

 

i dont know what might be wrong here

 

 

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