You can use the Deploy command to overwrite an item revision with a previous revision.
Regressions are enabled by default. For example, if you deploy an older version of an item (v3) it overwrites the latest version (v4).
To disable regressions, set the following variable in the CM configuration file to Yes:
DM_NO_DEPLOYMENT_REGRESSION
To fail deployments in the event that any have been disallowed, and to display an error message, set the following variable in the CM configuration file to Yes:
DM_REGRESSION_ATTEMPT_IS_AN_ERROR