Hi Kym,
...We have a customer that changes part numbers everytime they make a small revision to the part (i.e. move a .250" dia hole by .500"). Unfortunaely for us, when we receive an order for the new/revised part, it triggers our prototype process instead of our revision process.
Hi Kym:
Carol's example above is a little extreme from a customer perspective(although I know it happens). We've had this same discussion recently at my company. I would offer the following;
Considering this is a PCB change (components only to correct in internal error w/ the BOM), it would depend on how you identify the parts and what kind of traceability you need for that change. Do you have P/N and Revision screen printed on the PCB? If so, then the Rev change may be traceable and you will be able to segregate the parts and not mix them up in production.
However, if you don't have the Rev printed on the boards you'll need to decide the degree of the "what if". That is to say, "what if" the new and old PCB's get mixed up (How much time & money would this cost you?)? What about returned products - can you easily identify which board is in a returned product several months down the road. Are the parts interchangeable (I assume not, since the addition of components was made to fix an earlier omission)?
The reason I quoted Carol is that, I would assume (and maybe Carol can comment from a Supplier perspective) that if you contact your supplier of the PCB and indicate that the P/N change is only for traceability in your facility and that the board will not require new artwork, Gerber files, etc., then the Supplier will be able to "circumvent" the automatic trigger for additional cost that comes with a brand new P/N. ...just the addition pennies to add a couple more resistors.
...I hope this helps.
-Steve