If you try to save a current timesheet that contains a National Insurance (NI) override and encounter an error, it is because the NI threshold fields are missing or incomplete.
To resolve this issue, ensure that you fill in the NI threshold fields when entering the employee's NI override pay code.
To do this, follow the steps below in Portal.
Click Employee then in the search field, search for employee.
Beside the relevant employee, click VIEW.
Click Timesheets Current Period then click Add.
Select the relevant employee NI override pay code then populate the details.
Click OK then click the three dot icon.
Click NI Override then enter the thresholds.
Click OK then click Save.