Put it on your sitemap using Text
Text item=Kabuff_Tuer_Offen label=“Tür” icon=“door”
You are looking at the Thing, not the Item I suspect. When you look at the Thing that represents this sensor in PaperUI, it will tell you what type of Item you must use to link that channel to an Item.
I suspect you must use a Switch.
It is not clear to me what you are looking at so it is hard to answer. Item states are presistant in the system until you change a .items file or restart OH. At that point the Items get initialized to NULL (which will appear in your sitemap as “-”.
PaperUI is an administration UI so it doesn’t really let you control or show Items in general.
Please How to use code fences when posting logs.
