opened
marhew
username_0
As a case worker I want a usable and intuitive UI to get my work done.

Because Chimera supports multiple data objects of the same class being present in one case, e.g. several students in one seminar, users have to select which data object an activity operates on when they begin this activity. However, if there is only one data object available, the user should not see the selection arrow.

**Acceptance criteria**
- exists case model to demonstrate this feature
- explanatory text in the selection modal: "Select the data object on which to operate. The following data objects are available:" if there are several data objects
- directly begin activity, if only one data object available
no selection of data object in frontend if there is only 1 available
issue