Once journal transactions have been posted, you cannot directly modify the G/L accounts in the posted entries because they are part of the financial history. The only way to "move" the posted transactions to another G/L account is to reverse them and then repost them with the correct G/L account
Are the Journal Transactions Posted? If not then consider using Configuration Packages, Export the filtered data from the configuration package into Excel( Hoping this is Table 81). In Excel, update the G/L Account No. field for the selected transactions to the new G/L account.
Import the modified data back into Business Central through the configuration package. Validate the data to ensure that the modifications were applied correctly.
Once the modified journal transactions are imported, review them and post them as needed to reflect the changes in the G/L accounts.
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