I have defined a form. It is working fine. But it can not be closed. I have to close the database instead.
Hello Holger Hoffmann, Thank you for reporting the bug. Unfortunately without clear steps to reproduce it, we cannot track down the origin of the problem. Please provide a clearer set of step-by-step instructions on how to reproduce the problem. I have set the bug's status to 'NEEDINFO'. Please change it back to 'UNCONFIRMED' once the steps are provided
*** This bug has been marked as a duplicate of bug 155638 ***
I have solved the issue by creating a copy of the database. With the new database the form closes as expected.