Diagnosis
You have selected the 'Item Relevant for Delivery' field, although theitem type does not have value A or B.

System Response
This combination is not allowed and therefore cannot be saved.

Procedure
If the item is a value item or text item, set the item type to 'A# or'B'. Otherwise deselect the #Item Relevant for Delivery# field (even ifthe item category is relevant for delivery). You configure this propertyin transaction VOV6 in the respective schedule line category.

Explanation
Item types A (value item) and B (text item) usually do not have anyschedule lines. The #Item Relevant for Delivery# field in Customizingfor the item type is therefore only definitive for this particular case.