Should we include or exclude the VAT when drawing out an invoice for exchange difference?

My question is about invoices for exchange differences that occur when the prices of foreign exchange invoices of domestic sales are collected. Should we calculate the VAT by including it or additionally?

Exchange difference + VAT is calculated. The calculation is not made by including the VAT.

Example :
Exchange difference       : TRY 1.000

VAT – %18                          :  TRY  180

General Total                   : TRY  1.180

Source: İSMMMO
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