Change order of Forms field and other (system) fields in request

[Bernd Gurn]

We are using the Forms plugin (in the trial variant) to have more sophisticated forms in a portal request. The form is integrated automatically below all other visible (system) fields in the request (here of type service request). How to change the order of the forms area and the other fields (e.g. the attachment field should be on the bottom of the request, before the form)?