When you hover over a custom operation, icons for creating an input parameter () and for creating an output parameter () appear above the element.
Click on the corresponding icon of the parameter direction you want to create.
A mapping relation is automatically dragged out. Drag it to a connector of a property you want to use as parameter. This property defines name and data type of the parameter to be created.
All valid connectors are displayed in blue .
Drop the mapping relation on the connector of the selected property. The parameter is created and and the corresponding mapping relation is connected.
You can also start the mapping relation by clicking on the connector of the property you want to use as a parameter template. Drag it to the corresponding icon of the parameter direction you want to create and click it.
The newly created parameter automatically gets the same name and type as the property it is connected to.
The new parameter is also visible below the related operation in your data model.