Delete Personnel Numbers

Hi

My clent has deleted one personnel Number by using PU00, But when he go to Pa20 and enter particular deleted personnel number system gives a message "personnel number not assigned" but a flag will come in front of Personnel data.

Please suggest how to delete this personnel data.

I have a answer where he can rehire the personnel number and delete every thing again.

Can you please give me other options to delete the personnel data.

Thanks

Veer