Intercompany ISO price changes post line in shipping is interfaced & not matches with IC AR Invoice

Below is the scenario:
Item cost - 4.08
Requistion was created in another OU , create internal order were run
Import orders were run in shipping org , Internal sales order was created with same item with 1 qty. Sales order created had total price as 4.29.
Once the line is picked and shipped.
sales order price remains as 4.29 and when the moment line is interfaced status in shipping transaction form, sales order price is changed to 4.08 which is item cost.
Post this when we proceed with invoicing by runnning requests "Create intercompany invoice" and then "Autoinvoice master program".
we see the invoice amount is 4.29 wheras the sales order price was 4.29 initially changed to 4.08 post line was interfaced in shipping transaction form.