Adaptive Server does not automatically block attempts to downgrade to a minor version; however, do not attempt this, as the database dump can corrupt the server into which you are loading the dump.
When you downgrade from a version of Adaptive Server to a lower major version (such as version 15.x to 12.5x), Adaptive Server blocks the attempt with a message similar to:
ASE cannot load this database dump because the version in the dump is newer than the version in the database. Database: log version=7, upgrade version=35. Dump: log version=7, upgrade version=40.