What is a payroll accounting area? | SAP-HR

Payroll accounting area is an organizational unit defined for payroll accounting. It is the calculation of remuneration  for work performed by an employee. It provides the payroll driver with two types of information: number of employees and dates of the payroll period. The payroll accounting areas for an employee can be changed at the end of a month only.
You cannot enter a new payroll accounting area in the middle of a month, even if an employee has been changed from hourly-paid to salaried employee.