process payroll & payments in two different currencies

We are trying to process payroll in two different currencies. The main payroll currency is USD, but we also need to pay a fixed amount in GBP.

Our requirement is:

Pay 3000 GBP to the employee’s GBP bank account

Pay the remaining net amount in USD to the USD account

What we configured:

Created a GBP bank account under the employee’s personal payment methods

Set a fixed amount of 3000 to be paid to the GBP account

The remaining balance is paid in USD

Issue:

The system is treating the fixed amount (3000) as USD, not GBP. As a result:

It first deducts 3000 USD from the net pay