AX2009 Revaluation Voucher query

When we create a new calculation price for a BOM item and activated the price than AX created lots of cost revaluation voucher for that new calculation price. Out of the voucher some are amount are very minor. I would like to know:-

1. Why this minor figure revaluation voucher created?
2. Is it possible to stop this minor figured revaluation voucher? If yes than what will be effect in GL/other areas?

Thanks in Advance.