Click the Import Layers button from the Micro-Drainage tab.
In the pop-up window, the Layer field chooses Junction from the drop-down list.
Click the button next to the Input Source field to open the import window.
Select “…\Data\Manhole.shp” and click Open.
Then, click the Load button on the Import Required Layer window.
In the pop-up window, choose and Open the mapping file “…\Data\Junction.mapjunction”
The layer properties will be automatically mapped with the model properties. Click Import.
In the pop-up warning message window, click Overwrite.
In the Enumeration Mapping window, make sure mapping the categories as below and click OK. Then, the Junction layer will be successfully imported.