Message type: E = Error
Message class:  FINS_MIG_HBA - Migration Cockpit 
Message number: 026
Message text: Posting on Ledger &1 is not permitted.
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The SAP error message FINS_MIG_HBA026 indicates that posting to a specific ledger (denoted as &1) is not permitted. This error typically arises during financial postings or migrations, particularly when working with the New General Ledger (New GL) in SAP. Causes: Ledger Configuration: The ledger may not be configured to allow postings. This can happen if the ledger is set to be a statistical ledger or if it is not active for postings. Posting Period: The posting period may be closed or not open for the specific ledger. This is common in financial year-end processes. Document Type Restrictions: Certain document types may be restricted from posting to specific ledgers. Migration Settings: If you are performing a migration (e.g., during a system upgrade or data migration), the settings may not allow postings to that ledger. Authorization Issues: The user may not have the necessary authorizations to post to that ledger. Solutions: Check Ledger Configuration: Go to the configuration settings for the
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