Diagnosis
On the item overview, you have selected a number of items in order toenter sub-items for these items.
You are now looking at the detail screen of one of the selected itemsand want to get the detail screen for the next selected item usingfunction Item+.
A table is used to determine whether you can maintain sub-items for anitem category. The item category of the next selected item does notsupport sub-items.

Procedure
You can only enter sub-items for the next selected item if theindicator for sub-items was set in table T418 (Item Status) for theitem category concerned. Consult the department responsible formaintaining this table to check whether this is feasible.