Tax code default on claim lines by item

Hi All,

Can somebody please assist me to inform how the following scenario can be catered for in Trade Management

--> default tax code by items on claim lines when earnings are associated. 

I have an accrual offer, the customer order is entered in OM to execute the offer (the order will have multiple item lines - some taxable and others non taxable) , now i enter a claim and associate with the earnings created due to the order. My requirement is to default the tax codes on claim, item wise as it is in the respective order. 

How can this be achieved? i can see that when you select the checkbox "prorate associated earnings by products", you will have earnings associated by items, however the tax code does not default.