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 of theselected items and want to get the detail screen for the next selecteditem using function Item+.
As the detail screen you are looking at is for the last 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.