Diagnosis
On the alternative overview, you have chosen a function for editing ordisplaying one or more alternatives, but have not selected anyalternatives.

Procedure
Select the alternative(s) you want to edit or display. Either enter "x"in the selection list or place the cursor on the appropriate line(s)and press function key F9. Then choose your function again.
You also have the option of selecting all the alternatives in one step.To do this, choose menu function Edit --> Select -->Select all.
However, when changing a BOM you can only select one alternative. Oncethe first alternative has been edited, you can select another.