Diagnosis
On the item overview (all items for an alternative), you have selecteda number of items in order to create, change or display sub-items.
You are now looking at the detail screen for sub-items of one selecteditems, and want to get the detail screen for the previous selected itemusing function Item-.
As the detail screen you are looking at is for the first selected item,this message appears.

Procedure
Choose function Item+ to move in the other direction, or go backto the item overview using function key F3 and reselect as required.