Negative arrears calculated for positive input retrospection refers to the process of adjusting payroll records to correct past overpayments or discrepancies.
The reason why negative arrears are calculated when processing PIR is because of the pay code type. PIR will always use scale point 1 when applied to a scaled allowance pay code, which can depend on the scaled values, resulting in negative arrears.
To check if a pay code is a scaled allowance, follow the steps below in portal.
Click Settings then under Codes, click Pay Codes.
In the Search field, search for the pay code being applied in PIR.
On the Pay Code formula screen, the list of current scale rates will show if pay code is scaled rate allowance.
If scale rate allowance, arrears will need to be manually calculated and corrected via timesheet entry.