An Agreement (sort Of Warning Letter)

Dear all,
I need an agreement (sort of warning letter). Actually, in my comapny, we can not give warning letter for the first mistake. Thats why, my boss has asked me to issue an agreement kind of thing in which that employee confirms that he will not do this again and his mistakes also need to be mentioned in the agreement. That agreement will be issued by HR Director and that needs to be signed by the employee..
Can u please help me out in this. Because I know about Warning Letters or Termination Letters but this type of agreement, I have never made.
Please help me out in this..
Waiting for same
Thank you
Shweta

Dear Swetha
instead of agreement letter, ask the employee to give the apology letter which shoud contain the mistake and reson, he has to assure to management in future will not repeat the things. then record it to his personal file.
Mahesh

Hi Mahesh,
You seems to be right.. I have discussed this with the Director. However, he says that since he has already conveyed that he will issue an agreement then it has to be an agreement. Now what I can do is, I can put the content of Apology Letter and will give it a name as Agreement. Would that be fine?
Also, I need to get some formats for Apology letter as well. Can anyone please help me out with this?
Thank you,
Shweta