How to avoid VAT calculation on import orders where same Item is importing as well as procuring loc

How to avoid VAT calculation on import orders where same item is importing as well as  procured locally.

Requirment : System should calculate VAT only for local procurment wheres as for Import order system should not calculate any value for tran code 87. ( Item is same for both the orders).

Scenario: Item A have 2 VAT regions.

                  Item A VAT region  1000  Vat Code = Z  Vat Rate    = 0%

                  Item A  VAT region 2000  VAT Code = S VAT Rate = 20%.

Supplier Site = S1 VAT region 1000 (Import Supplier)

Supplier Site = S2 VAT region 2000 (local Supplier)

Location L1, VAT Region = 2000.         

  

  System setup and Version of Application.

  RMS 13.2

  System option: VAT_IND = Y