Message type: E = Error
Message class:  DA - Dictionary: Compare, distribution, timer, instantiation 
Message number: 544
Message text: Table & has key field feature not supported by DB &
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The SAP error message DA544 indicates that a specific database table has a key field feature that is not supported by the underlying database system. This typically occurs when you are trying to use a feature or functionality in SAP that is not compatible with the database you are using.
Cause: Database Compatibility: The database you are using (e.g., Oracle, SQL Server, HANA, etc.) may not support certain key field features that SAP is trying to implement. This can happen if the table is defined with certain constraints or features that are not supported by the database. Table Definition: The table definition in the ABAP Dictionary may include key fields or constraints that are not compatible with the database's capabilities. Database Version: The version of the database you are using may not support the features that are being utilized in the SAP application.
Solution: Check Database Compatibility: Verify that the database you are using is compatible
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