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Phase 0: Before the Migration Date 
Before the migration date, you define your migration plan in the New GL Migration Cockpit. The migration plan acts as a kind of organizational parenthesis around the data to be migrated. In the migration plan, you make fundamental specifications such as the migration date, the migration type (with or without document splitting), the target ledgers concerned, and the participating company codes.
Company codes that share identical fiscal year limits can be migrated together. In the case of very large volumes of data, you need to define multiple migration plans to conduct the migration company code by company code.
Before you can make the Customizing settings for the migration, the Customizing settings for New General Ledger Accounting need to be made. You do this in Customizing for Financial Accounting (New).
For information about setting up New General Ledger Accounting, see the documentation in the SAP Library as well as the Implementation Guide documentation on the individual IMG activities.
