Message type: E = Error
Message class:  FAGL_MIG - Migration to New General Ledger Accounting 
Message number: 226
Message text: Reversal of an FI-AA doc. in Fin. Accounting during ledger implementation
You want to reverse the document with the number &V1& in company code
&V2&. However, this document was posted in Asset Accounting, not in
Financial Accounting.
It is only possible to reverse such documents in Financial Accounting if
you use a migration service for the transition from the account approach
to the ledger approach when you implement new General Ledger Accounting
or when you implement a new ledger in new General Ledger Accounting.
Note the activities in the migration cockpit.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FAGL_MIG226 typically occurs during the migration process when you are trying to reverse a Financial Accounting (FI) document related to Asset Accounting (FI-AA) in the context of ledger implementation. This error can arise due to various reasons, and understanding the cause and finding a solution is crucial for a smooth migration process. Cause of FAGL_MIG226 Document Type Issues: The document type used for the FI-AA document may not be configured correctly for reversal in the new ledger setup. Inconsistent Data: There may be inconsistencies in the data between the old and new ledgers, especially if the migration process did not properly handle all relevant documents. Missing Configuration: The necessary configuration for asset accounting or the new ledger may not be complete, leading to issues when attempting to reverse documents. Posting Period Issues: The posting period for the document you are trying to reverse may be closed or not open for the
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