Question on Payroll flow pattern

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Question on Payroll flow pattern

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Hi Team,

What is the difference between predefined rollback single and rollback process in payroll flow pattern activity? Can you provide example on which scenario, we can utilize them in payroll flow pattern. Similarly, predefined 'Retry payroll or retroactive calculation', 'Retry payroll process', 'Mark for retry'.  

How it is different from the task action of rollback/mark for retry?

Thanks,