What are the limitations for creating AWS EC2 instances within OnApp?
You can create EC2 instances using AWS Marketplace AMIs listed in the OnApp interface. For all AMIs, all instance types are listed, even if they are not supported and cannot be used for EC2 instances. If you choose an instance type that is not supported, the EC2 instance will not be created and the system will report an error after the EC2 instance creation wizard completes.
The reason is that Amazon's public API is feature limited.