If you are rolling back after having used any of the 12.5.4 features, additional steps can be necessary. You should take steps before you downgrade to pre-12.5.4, and others should be performed immediately after downgrading. Areas of concern are listed for each new feature.
In general, no additional steps are required when you are returning to an Adaptive Server version in which the feature was already available. When returning to a server version earlier than the version in which the feature was introduced, you must be aware of the areas of concern listed below.