For initial installations (new SAP customers), the new G/L is active by default in mySAP ERP. SAP advises that customers with new installations use the new G/L. These customers can still use the classic G/L if they prefer, but this may cause difficulties for future G/L migration projects. If existing customers want to use the new G/L, they have to activate it. You can activate the new G/L by following the IMG menu path Financial Accounting>Financial Accounting Global Settings>Activate New General Ledger Accounting or by transaction code FAGL_ACTIVATION. Make sure to select the New General Ledger Accounting Is Active check box.During a release upgrade, the classic G/L (totals table GLT0) remains active at first. You can hide the old conventional G/L configuration menu by running program RFAGL_SWAP_IMG_OLD.*********Activating the new G/L results in system-wide changes to the application menu, screens, and customizing paths. For example, a new configuration menu path appears in the IMG. However, new G/L migration is more than a technical transfer, so you should consider it a separate project. Your migration approach depends on the existing and target design of your G/L. Based on the complexity level, you may find it a simpler solution or more complicated solution leading to conceptual changes.For example, if your current G/L design does not include parallel ledgers or account solutions for the parallel valuation,you can use the simple migration solution. However, the migration project becomes more complicated if, for example,you use an existing classic G/L with PCA, have an account approach for parallel accounting, or the target design can accommodate an account or parallel ledger approach with or without a split. These examples are only a fraction of possible finance architectures. As a best practice, you should complete a careful analysis on the existing finance processes and you should carefully determine the new G/L scope.Lets first look at the situation in which you as a customer find yourselfbefore we look at new transactions and reports and compare totalsrecords in the classic General Ledger with those in New G/L. Activationof New G/L will be carried out differently depending on whether youare a new customer or an existing customer. During a new installation, New G/L accounting in the standard system is set to active. While the use of the classic General Ledger is theoretically also possible for new customers, SAP advises against using it because doing so will necessitate an additional, and avoidable, migration effort later on. The expense involved in a migration is significant.In contrast, during the release upgrade for an SAP R/3 system to SAP ERP, the classic General Ledger initially continues to remain active. Totals table GLT0 remains in effect. If you want to switch from the classic General Ledger to New G/L, you can do this in the course of a project in a second step, after the upgrade. In that step you have the choice (so it is not absolutely necessary) of activating and using New G/L. Activation also produces cross-client changes. These changes affect the paths in the application and in Customizing for the SAP ERP system.After activating New G/L, in addition to the classic paths in Customizing, you will now also fi nd new paths for New G/L accounting The already known classic fi nancial accounting paths continue to remain available for better orientation. You will also see new menu paths in the application and in the SAP Easy Access menu, as a result of the activation of New G/L. New transactions appear, such as FB50L (Enter G/L account document for ledger group (enjoy transaction)), or FB01L (Enter general posting for ledger group) If, after activating New G/L, you want to work exclusively with the paths of New G/L accounting, you can hide the classic financial accounting paths using the RFAGL_SWAP_IMG_OLD program. In Transaction SA38 you are provided with four small programs to display Customizing and menu paths for classic and New G/L.Lets look again at the transition from the classic to New G/L. In the standard system, when you activate New G/L accounting, the balances are also updated in the tables of the classic General Ledger accounting (totals table GLT0) in addition to the tables of New G/L accounting. This parallel updating may be useful for a period of time, from a security point of view. A comparative report can give you the guarantee that New G/L accounting is capable of delivering the right results. The menu path to the report for comparing data is Financial Accounting (new) Financial Accounting Basic Settings (new) Tools Compare Ledgers. You can use Transaction GCAC (Ledger Comparison) to compare the totals records of any two ledgers;Here you can also compare local and global ledgers with each other, as well as those ledgers with differing fiscal year variants and charts of accounts. In the standard system, the comparison is made at the level of the organizational unit (company code or company) and of the account, but you can also incorporate further fields into the comparison, such as the business area, functional area, and cost center. Among other options, you also have the option to compare currency amounts and quantities. Using this report called by Transaction GCAC, you can compare the totals records in the tables of New G/L accounting with the totals records in the tables of the classic General Ledger accounting (GLT0). Without a data migration, the differences shown are those arising from transactions prior to the activation of New G/L.