A bill of material revision is an item revision which indicates that the components of an item have changed. You do not have to use item revisions when you change bills of material, however, in some industries, it is best to create a new item revision when you change a bill of material.
Navigate to the Item Revisions window. Do this by choosing the Revisions button from the Bills of Material window.
Enter an alphanumeric revision for the item.
Enter the effective date of the item revision.