Message type: E = Error
Message class:  HRPAYAT_ASV01 - Messages for the Payroll Function ASV01 
Message number: 109
Message text: Unknown Parameter1 for function ANTS0
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The SAP error message HRPAYAT_ASV01109, which indicates "Unknown Parameter1 for function ANTS0," typically arises in the context of payroll processing within the SAP HR module. This error suggests that there is an issue with the parameters being passed to the function module ANTS0, which is used for payroll calculations.
Cause: Incorrect Configuration: The error may occur due to incorrect configuration in the payroll schema or the absence of necessary parameters in the payroll processing logic. Missing or Incorrect Data: If the employee master data or infotypes are incomplete or incorrectly maintained, it can lead to this error. Custom Enhancements: If there are custom enhancements or modifications in the payroll process, they might not be handling the parameters correctly. Version Issues: Sometimes, the error can be related to version mismatches or updates that have not been applied correctly.
Solution: Check Payroll Schema: Review the payroll schema to ensure that all necessary parameters are defined correctly. Look for any
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