Price calculation through Rest API for partial Order lines

Summary:

Hello,

we need a Solution in which we can create a Order through the REST API Service in which we have the following Scenario:

Order Line 1. --> Price will be calculated based on Oracle Pricing setup

Order Line 2. --> Price will be calculated based on Oracle Pricing setup

Order Line 3 --> Price will be sent through REST API (should not be calcualted based on Pricing setup)

Right now in our REST API call we have the Invalid attribute "FreezePriceFlag" and the "FreezeShippingChargeFlag" in the payload on the Header which would mean it will always pick the claculated Price from the Pricing setup for ALL lines, but we need it basically on line level becasue it should be valid not for all lines as the example above is showing.