Hi, Ampcom
Thanks for your post.
Generally, the header account is the total amount of each detailed account so it cannot be changed as it only changes depending on the figures or balance that the detailed account has. Also, when updating opening balances, it can be updated depending on how transactions are recorded against the account. You may also check The Help Article: Entering opening balances for further information on your concern. We highly recommend as well speaking with your accountant regarding the issue.
Please let us know if you require further assistance with this.
Best regards,
Doreen
