Hi Filip,
You can create a combo box component and attach a parameter in the Bound Parameter property field. The parameter can be a delimited list parameter with display and value items True,False.
The selected parameter value can be passed to the business rule with the Selection Changed Server Task Arguments e.g. {Boolean_SolutionHelper}{ReturnValueTest}{Boolean=[|!prmTrueFalse!|]}
In your business rule you can set a boolean as per example below:
If args.FunctionName.XFEqualsIgnoreCase("ReturnValueTest") Then
Dim myBoolean As Boolean = args.NameValuePairs("Boolean")
End If
