Employee personal number

Personal Number for employees

Dear All

Our clients would like to keep the employees old personal number along with the new personal number in SAP. For eg: Old number is 005 and new number should be 90005, where 90 has to be prefixed. This requirement is very urgent and I don’t have a clue on this. Does this has something to do with referrence personal number.

Please give me an idea to solve this problem

Points will be awarded for correct answers.

Thanks and regards

Santhosh.S