Using the Tax Derivation table (P48127) for transactions with different tax codes

We are looking at implementing Service Billing and have a situation where recoverable expenses being charged to the same cost code may have different tax treatments and thus use different tax rate/area and tax codes for billing purposes.  From looking at the Tax Derivation table, it looks like I can only tag one tax rate/area and code to an object/subsidiary range.  My key type = 6.  Has anyone come across a similiar scenario or be able to offer up suggestions?  Thanks.