In SAP FICO, substitution is a process used to automatically replace or populate certain fields in financial transactions based on predefined rules. When posting documents, if certain conditions are met, substitution rules can automatically insert values into specific fields. This helps in standardizing entries, ensuring data consistency, and reducing manual errors. For example, a substitution rule might automatically fill in a profit center or cost center based on the company code or account type used in the transaction. Substitution can be configured in the system using transaction code GGB1, and is commonly used in scenarios like financial reporting, controlling, and accounting processes.
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