Learning Path Constrain Your Data Using XPath

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HI all, according to learning path Constrain Your Data Using XPath step 3.4.1 I added an action button to the data grid which is supposed to call a microflow:   However, when I run the app and click the button, this notification pops up and the microflow is NOT triggered:   Now, when I select an item in the list, the microflow is triggered and I hit my breakpoint:     →     Why does the Microflow only get triggered when I select an item in the list? The learning path does not mention this. Is this a potential defect in the software or a normal behavior?   Mendix Studio Pro Version: 8.3 Thanks Steffen
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I guess that due to the microflow required a input param (is VacationRequest).

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