Create an App with Advanced Page Building

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Hi, I am building this app threw  learning path. I am Stuck while creating this microflow ACT_RequestLine_Edit. can anyone tell me the Expression which i need to write inside that decision (1 Request line Selected) ?  
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2 answers
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IMHO logically you need:

$Count = 1

Reason is that if multiple lines are selected, you need to inform the user that only one should be selected.

But $Count>=1 works too, it will only not generate an error and select the first in the list.

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I Suppose it wil b:e

$Count > = 1

 

As I suppose that if there is more than one it takes the first one (with the head activity) and pass it (with the sow page) to the next page...

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