Select to include informational messages in your generated SQL. You should alway include informational messages whenever you generate SQL for an object created using Data Description Specification (DDS). DDS is used to describe data attributes in file descriptions external to the application program that processes the data. You can then determine if you will need to make changes to the generated SQL in order for it to run correctly. Once you make all the necessary changes, you may want to generate the SQL without the informational messages.
If the object that you are generating SQL for was originally created using SQL, there should not be any informational messages.