Hi
Do you check customizing in table FAGLCOFITRFLDS ?
Define Field Transfers for Real-Time Integration
Use
In this activity, you define the fields that are not used explicitly in new General Ledger Accounting but that you want to transfer to FI with real-time integration. These fields are not updated in the tables of new General Ledger Accounting. Instead, they are only updated in the corresponding receiver fields of the line item table in classic General Ledger Accounting.
Dependencies
If new General Ledger Accounting is not activated in your system, the system transfers all fields that have corresponding receiver fields in the line item table in classic General Ledger Accounting.
When these settings are transported, the program code required for transferring fields is not generated automatically in the receiver system. In the receiver system for the transport, run transaction FAGL_COFI_GENERATOR in all relevant clients.
Activities
Set the Transfer Field to FI indicator for all fields that need to be updated in the line item table in classic General Ledger Accounting.
Example
You want the order number to be transferred from the CO document to the FI document. Set the appropriate indicator and save your changes.