Error 4371 when trying to create a Manual Payment (P0413M) with alternate currency option activated

We already have the AAI´s setup for alternate currency payments, and the PO for activating payments with alternate currency with "1" on the P0413M.

The base currency of the company is ARS, we have a voucher in GBP which we want to pay from a Bank Account in USD. When creating the manual payment (P0413M), we enter the header information using the foreign currency from the voucher (GBP) . We then select the Pay Items, and after that, we access to the Alternate Currency form. When entering the alternate currency code in this form, we are getting the error 4371 (invalid parameters).