When you run a personnel action on the middle of the month, it will cause a split in the payroll period. Depending on the customizing of view V_530_E, field ‘Account.split’ (PERSP), it will generate a WPBP split or a payroll split at the moment of running payroll:
Period split for payroll accounting, possible entries:
Space –> do not separate payroll results
X –> separate payroll results
For Payroll Portugal, we, from the product team, suggest to read the KBA 2379613 – Scenarios where payroll split should be used to know when you should use a WPBP or payroll split depending on each situation.