VAT Calculation IN MIRO after changing Assessable value in J1IEX

Dear All,

While capturing the excise invoice in J1iEX, we changed the Excise Values under BED, ECESS and SECESS tab , keeping Assessable value field intact. While doing MIRO, how can I bring the new assessable value for calculating VAT?

I understand that JVRD (VAT condition ) value flows from PO level. But any manual change in J1IEX, will it affect the VAT calculation in MIRO?