engineVersion
The name of your custom engine version (CEV).
For RDS Custom for Oracle, the name format is 19.*customized_string*. For example, a valid CEV name is 19.my_cev1.
For RDS for SQL Server and RDS Custom for SQL Server, the name format is major engine_version*.*minor_engine_version*.*customized_string*. For example, a valid CEV name is 16.00.4215.2.my_cev1.
The CEV name is unique per customer per Amazon Web Services Regions.