1. Product Version
Astah Professional 6.7 and 6.8

2. Description
Generating SQL scripts fails if the ER Diagram contains a Subtype relationship and one end has a Primary key like the figure below.


























3. Solution
Change one of the options on [Export SQL] dialog.
(1) Go to [Tool] - [ER Diagram] and open [Export SQL] dialog and click [Option] button













(2) Remove the check from [Export Create Table statement with constraints (OFF : Alter Table)] and click OK

















Now SQL scripts would be generated without errors.

4. Status
This bug will be fixed in the next release.

5. Bug ID
5138/5313

PS: Thank you for your report, Marcelo.