If you provide a `commit ID`, the step deploys the content of the specified commit to the ABAP system. If you provide a `branch`, the step deploys the content of the specified branch. If you set the `rollback` parameter to *true*, the step returns to a working state of the repository, if the deployment of the specified commit or branch fails.
Learn more about the SAP Git-enabled Change & Transport System (gCTS) [here](https://help.sap.com/viewer/4a368c163b08418890a406d413933ba7/latest/en-US/f319b168e87e42149e25e13c08d002b9.html). With gCTS, ABAP developments on ABAP servers can be maintained in Git repositories.