ABAP analysis is available starting in Developer Edition.
Discover and update the ABAP-specific properties in: Administration > General Settings > Languages > ABAP
In order to analyze your source code with SonarQube you need to first extract it from SAP onto a filesystem. You can use your own tool or an open source tool; SonarSource does not provide any connectors or source code extraction tools.
You can also use abapGit client to manage your project in a Git repository and analyze it directly from your DevOps system.