Shipment cost - G/L Account

Hi !

In "Create shipment cost" (T.code VI01), for Account assignment, G/L account is automatically detemined based on

Chart of account

Transaction (like GBB)

General modification (like VBR)

Valuation class

Where do we link the above four with shipment cost document?

For example, currently I am getting a G/L account for combination : (coCd: XYZ, Transaction: GBB, General mod: VBR, Valuation class: 3200) in shipment cost doc. Suppose, I want it for a different combination (let's say based on : XYZ, FR1, 3042) in my shipment cost document. How this can be achieved in customizing?