How to activate FAGLFLEXT in SAP 4.5b version?

In the SAP 4.5b version, the FAGLFLEXT table is related to the New General Ledger Accounting (New G/L) functionality. To activate the New G/L and enable the FAGLFLEXT table, you need to follow these general steps:

1. Perform system preparations: Ensure that your system meets the prerequisites for activating the New G/L. This includes applying any necessary SAP Notes, performing system updates, and verifying system compatibility.
2. Activate the New G/L: Use the transaction code SFW5 to activate the New G/L in your SAP system. This transaction allows you to enable the necessary business function(s) for the New G/L. In the case of SAP 4.5b, the relevant business function might be "FIN_GL_CI_1" or a similar variant.
3. Configure the New G/L settings: After activating the New G/L, use the transaction code SPRO to access the SAP Reference IMG (Implementation Guide). From there, navigate to the Financial Accounting section and select the New General Ledger Accounting node. Configure the settings according to your specific business requirements. This includes defining parallel ledgers, document splitting, and other New G/L functionalities.
4. Perform data migration (if applicable): If you are transitioning from the classic General Ledger to the New G/L, you might need to perform data migration. The migration process involves transferring the existing data from the classic General Ledger to the New G/L, including the migration of line item data to the FAGLFLEXT table.

Please note that SAP 4.5b is a relatively old version, and the activation and configuration steps may vary. It is highly recommended to consult the official SAP documentation, relevant SAP Notes, or engage with experienced SAP consultants for detailed guidance specific to your SAP 4.5b system.