Cannot insert PageBreak into standard Richtext Item

I am trying to do a very simple standard thing.

I have created a document containing a standard richtext item. I can do everything with this item, but I cannot insert a pagebreak through menu Create and then Page Braek. The menu item is gray / not available.

I have discovered that I can insert a pagebreak into an email during composing. So I have compared all options and parameters of my richtext field to the standard email body field. All the same!

Strange is also, when I change the richtext item type to “save as HTML and Mime”, then it works.

Any explanations to this? Or even better a solution or workaround?