From the Customer Care Purchase Order Review and Guidelines from 2019:

Side Note: **For price discrepancies on parts and accessory orders, Customer Care Representatives may approve certain price discrepancies. See guidelines below:

1. If the PO value is higher than the SAP total:  a new PO must be provided or an email from an authorized person within the company agreeing to pay the lesser amount.  (You create the email, send to customer (buyer) asking for them to reply with their approval to pay lesser amount.)
 

Save the email authorization, attach to the quote, or forward the email to Customer Care.

This is intended for relatively smaller discrepancies, not for large, major differences.