Generators/Sequences are supported by some databases like Firebird, Oracle, SQLite, etc.. To open the generator editor, you should double-click on the desired generator on the Project explorer.
Generators are a resource to generate number sequences. You can specify an initial number and the desired increment, and each time a value is selected in this Generator, a new number is generated. To create a new generator, select Object / Generator on the Create tab on the Home ribbon.
All Generators created in the project are listed under Generators section in the Project explorer. By double-clicking on the desired Generator, the Generators editor will open showing:
•Start with: initial value of the sequence generator (specified when creating the object).