AP Invoice Exchange Rate Variance Account is incorrect

When doing fixed asset procurement business : The PR destination type is expense, the distribution < Charge Account > is Fixed Assets-In Transit, and the <Variance Account> is automatically consistent with the < Charge Account >.

PR AutoCreate PO, PO destination type (expense), Variance Account (Fixed Assets-In Transit) are consistent with PR.

There is an exchange rate difference between the exchange rate on the PO receiving date and the exchange rate on the invoice date.

AP invoice has matched PO and Validated the invoice. the invoice distribution line generates an Exchange Rate Variance account (Fixed Assets-In Transit) , Generate Exchange Rate Variance account (Fixed Assets-In Transit) after Create Accounting.