Assigning a Revision Level to a Material 
How to assign a revision level:
- Process (create or change) the material BOM with reference to a change number.
- Go to an item overview, item detail screen, or header detail screen.
- Choose Extras → New revision level.
The system checks that no revision level has been assigned to the BOM header material for this change number.
- If no revision level has been assigned for this change number, the system determines the next revision level defined. You see a dialog box informing you which revision level is assigned to the BOM header material.
Save the BOM.
- If a revision level has been assigned for this change number, you see an error message. You can only assign a new revision level if you change the BOM header material with reference to a different change number.