Hi Priya,
There must be a posibility for this, according to my logic User ID are unique in nature.
Let us take an example to clarify this:
Employee - X is working with organization from 01.01.2013 - 30.04.2014 and he left, so now company is not going to pay the licence fee for his life time because he is no more a valid user. In the similar way they are many a companies whose attration rate is 20+% percentage of its actual head count on quarterly basis.
If they are going to pay for 100 user licence no one opts SAP. So there must be a way/ solution for which many of us don't know the answer till we actually dig into the reality.
As suggested by Kedar above, You can change the name in SU01 for an User as shown below:
And also check the tab Logon Data where we have fields like valid from & valid to as shown below:
I strongly believe this deals about the Licence period, like RAMYA is valid from 01.01.2013 valid to 30.04.2014 (Delimit licence) from which you can use this licence to another user like HR1.
Check with your basis / security consultant who is a senior you can find a solution for this.
Best Regards,
Srikanth Naidu. A