Chart of Accounts Mapping

We have a primary ledger that is associated with a secondary ledger and there is a chart of accounts mapping that connects the values in the account segment in the primary ledger with that of the secondary ledger. This chart of accounts mapping grid that is embedded as a part of the product does not retain any history when a change is made in the account mapping values between the primary and secondary ledger. In the absence of this history (such as last update date and user details of the person making the change), it sometimes becomes extremely difficult to