Diagnosis
You want to change or display the BOM for material &V2& with referenceto revision level &V1&.
This is not possible, because no change to the material with a changenumber has also been assigned revision level &V1&.

Procedure
To display all changes to material &V2& that have been assigned arevision level, starting from the engineering change management menuchoose menu option Revision level -> Material rev. level ->Display.