AR revenue accounting by Item from OM shipments

Hi ,

Client uses the auto accounting where revenue account segment is derived from the Trx types. We have majority of the invoices flowing from Order management.

By following this way, all the invoice lines get accounted to the same revenue account.

There are few exceptions where the item in sales order should drive the accounting because the trx type is too generic. Basically if an order has 10 lines, 8 lines should go for revenue account attached to

AR transaction type. The remaining two lines should derive the revenue account from the item setup.

Can any one help me out in configuring this