Normally, this setup form is used to configure the posting profile for accounts that are generated after clicking Create default types, such as Penny difference in accounting currency. However, the best practice is to configure posting profiles in their relevant forms. In your case, the Exchange Rate Gain and Loss accounts should be set up in the Ledger form. However, if those accounts are not set up in the Ledger form and you configure the Exchange Rate Gain and Loss accounts under Accounts for automatic transactions, then the system will pick the account from this form and post the entries without generating an error. For the second part of your question—which accounts need to be set up under Accounts for automatic transactions?These should be the same accounts that you intend to configure in the relevant posting profile setup. Further details can be found in the Microsoft documentation. https://learn.microsoft.com/en-us/dynamics365/finance/general-ledger/accounts-for-auto-transactions Additionally, you can find Recomended practise for the posting profile setup in the following documentation. https://learn.microsoft.com/en-us/dynamics365/finance/general-ledger/recommended-practices-pstg-prfles
