Message type: E = Error
Message class:  HRPAYAT_MBGM - Messages for mBGM Functionality 
Message number: 255
Message text: Default mapping used for &1 &2 &3 &4
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The SAP error message HRPAYAT_MBGM255, which states "Default mapping used for &1 &2 &3 &4," typically occurs in the context of payroll processing, particularly when there is an issue with the mapping of wage types or other payroll-related data.
Cause: Missing Mapping Configuration: The error usually indicates that the system could not find a specific mapping for the wage types or other payroll elements being processed. This can happen if the configuration for the mapping is incomplete or incorrect. Data Issues: There may be issues with the data being processed, such as missing or incorrect entries in the relevant tables. Customizations: If there are custom developments or enhancements in the payroll process, they may not be correctly configured or may conflict with standard settings.
Solution: Check Mapping Configuration: Go to the relevant configuration settings in the SAP system (usually in the IMG under Payroll). Verify that the mappings for the wage types or other payroll elements are correctly
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