To reset the balance of the particular internal account, follow the steps below.
Go to Accounts > Search > Accounts.
On the Accounts search page, find Account type, select INTERNAL and click Search.
Find the internal account in question and click the Account number to access the account information.
Choose Accounts from the content menu.
On the Account details page, scroll to the Account balances section and click the Reset balance button.
Confirm the balance reset.