The bill of manufacturing requires specific part numbers to insure the engineering integrity of each parent item.  If a particular component can be purchased by revision and there is a qualitative difference among revisions, each revision must be represented by a unique item ID so that the correct revision can be assigned to the BOMs where it is used.  If a component’s revisions are interchangeable, meaning there is no qualitative difference from on revision to another, a single item ID can be used.    

Use the BOM Component Replace for engineering changes

Create unique item ID part numbers for each respective engineering revision of your purchased items.   You can then use the BOM Component Replace to swap out the old revision Item ID for the latest Item ID revision in all places where the old component was used.   Using the BOM Component Replace allows you to be very specific when you swap out a new purchased revision and this will automatically flow through to MRP new Jobs and purchase orders.