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

Requirement : System should calculate VAT only for local procurement 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

DEFAULT_TAX_TYPE = SVAT

  Department =     Retail incl. VAT IND = Y

  Class = Retail incl.VAT IND = Y