How to Modify in Data IT0001?

Hi Experts,

I have a Faced one Problem.

My Requirement: In case End user Wrong Hiring Process of Employees, Then how to Change of Data in IT0001 ?

Example:

Wrong Data in IT0001: Company Code:1000

PA :ABCD

PSA :100

Then I want this type

Correct Data in IT0001: Company Code:2000

PA :WXYZ

PSA :200

How to Change this Problem ?

Please give me any suggestions..

Thanks

Ramesh.