Check using transaction code AUT10.
select usage as transaction code and check for CS01 and CS02.
Let's Assume for a material A there's a component B with 1 quantity.and let the BOM number of A be
00003195.(you can get this BOM number details in CS03 under BOM header)
Now without change number you are making the changes like deleting the item B and adding a new
component say C with 2 quantity and a component scrap of 5 %.
In AUT10,enter the T code as CS02 and then the date range for which you want to check.
After executing you will be able to see component B under old value column and C under new value
column along with the component scrap row.
Now acually it may take time to understand the report as such.
check and revert back.