What are the main revision fields used in Engineering Change Orders (ECO)?

Bill Revision Level  Alias: BREV
    A value that indicates the revision level of a bill of material. It is usually used in conjunction with an engineering change notice or engineering change order. The revision

level of the bill of material should match the revision level of its associated routing, although the system does not check this. Thisvalue is defined and maintained by the user.

This field is displayed in the BOM (V3002) header as Bill Rev. Level.                                   

Component Revision Number  Alias: CMRV
A code that indicates the current revision level of a component on the bill of material. It is usually used with an engineering change notice (ECN) or engineering change order