Dear SAP SAP,
having Calculat. type - B Fixed amount requires to have price conditions filled out for all items on item level before you insert freight at header level - to be splitted. For freight it is better to have D o E - gross or net weight, this remains constant.
With additional updates in price conditions for each line items, logic flow problem may arise for freight at header level for Fixed amount.
Btw. having ticked RounddiffComp X for Fixed amount Calculation type is not allowed combination for my SAP.