Changing NI Status for an Employee Contracted Out of SERPS 
If the National Insurance status of an employee changes – for example, if the employee decides to join a company pension scheme which is contracted out of SERPS – you need to create a new National Insurance (infotype 0069) record for this employee. This record must be valid from the exact date that the NI status changed. This ensures that the new contributions are calculated from the correct date.
Procedure
The Maintain HR Master Data screen appears
Use the matchcode function to find a number you do not know.
The Copy National Ins. GB screen appears.
Result
The employee’s National Insurance contributions are deducted at the appropriate contracted-out rate from now on.