From the looks of it, it seems that boolean may not be supported. In fact I tried with the linked example and nothing but double works. So I think you are better of creating a harness model ( Analysis > Harness > Create From Model) from your main model and add data conversion blocks . So the harness model will have double input port --> Data Conversion from double to boolean --> Main model boolean input port. Shown in the picture below:
Then using the harness you can map it now. Screenshot below: