instead of using Excel Exporter you should try to use Advanced Excel module:
https://marketplace.mendix.com/link/component/116370
Bernhard,
In one of my apps, we use the template edit pages provided with the Excel Exporter module. In these pages, the Sequence is editable. A couple of things you can check:
Maybe one of those things will help you resolve this issue.
Mike
Dear all,
thank you for your feedback. In the meantime I have solved the problem - for some reason the sequence field in the dialog was set to not writable; I changed that and it worked!
Best regards,
Bernhard