Derive Receivables Freight line segment values based on Item Sales Account using SLA

Summary:

We have created SLA rules on the Freight accounting class to fetch 3 segments from the Item Level Sales Account.

We are deriving the revenue account combination from the item sales account, but for the freight line, we want 3 segment values from item sales account. But as I understand, to derive COA values from the Item Sales account, the line in AR has to have a Warehouse value, which is not available for the freight line.

We want to derive eg segment 2. In the above example, freight line segment 2 is 3999, which should be 3020 (same as revenue line distribution.

Appreciate inputs on this!