The screen to select a current activity is always displayed if you have not yet selected a current activity and the required action requires one.
Select the activity and click OK.
If your activity is not in the list, you can create a new activity. Continue with the next step, otherwise this procedure is finished and you can start to build an extension.
To create a new activity, click New.
Specify at least Activity Name. The other fields are optional. Activity Documentation is used as default revision text during check-in of extensions.