how to tace the change no for a certain BOM?

I have a BOM(bill of material).and from time to time,engineer like to change the BOM by using "Change Number" ,so it is clear in the menu of T.C cs03, you can find the "change no.",but this T.C is only down to the second lower level and not down to the lowest level,

For me, I want to export the whole BOM out and with change no. attached,then I can trace all change no. for this BOM

Any advices are welcome

helai