Microsoft Dynamics Navision auto-post an entry to forex difference when I apply payments from a bank account to a vendor invoice of the same currency, although I posted the payment and invoice in the same month, and in the currencies I set the currency exchange rate for example on 1st January, so I presume that Navision should use that currency exchange rate for rest of the month. and I did not update the currency after that day, the invoice date posted was 27th January. The currency of the invoice and bank were both GBP. How can I fix this error, no currency exchange difference should be posted in such transaction.
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