Manual Back Pay Elements to be able to select relevant NI Period correction

When the system applies backdated salary and you have the option to Select how NI is calculated, need the same option when using manual pay elements as may not agree with the system calculate and process back pay manually.

To have the ability to update NI Bandings example an EE is overpaid in 1 month, and you recover following month the deduction doesn't apply the correction to the right banding fields for NI.