If a user edits a job-configuration he will see all changes made by used plugins too, if an update on plugins was made before.
It is not transparent who made that changes and which are made by an update of plugins.

It would be better, if the automated changes on updates of plugins were logged seperatly by a technical user.

I have attached an example where the only change that was made by the user on the job-configuration was:

<spec>0 21 * * 1-6</spec>

All other changes came from an update of maven2-modulset plugin.

I hope i was able to make the problem more transparent.

Thank you for your help and support.