That is by design, as soon as you click Save and schedule it creates the scheduled task for that particular report.The page is then set back defaults for the next task to be created.
Since this task has been already created modifying the webpage would just be modifying the next scheduled task not the previously scheduled task.
If you want to change the emails simply delete the original scheduled task and schedule a new job.
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Ok sorry, I thought you were in the webconsole for ERP. Yes that should work. Please open a case with support and request a defect be created for this.