Importing Tax calculated at 3rd party in the sales order

Hi,

We have a requirement where we want to import Tax calculated at the 3rd party to be imported in the Sales Order. Our Tax setup is not correct and we have only 1 customer for which we do not want to do the tax setup. Hence we want to import the tax AS IS in the sales order.

For this we are creating Tax as an Item and importing the same in Sales Order and this is flowing down to AR. But in AR when i am inserting line for Gl code combination in RA_INTERFACE_DISTRIBUTIONS_ALL, system is still taking Accounting rules for GCC.