Struggling to Write a Warning Letter for Attitude Issues? Need Help with the Right Approach?

Need a warning letter for attitude towards co-workers and customers. Not sure which one to use. Can anyone help?

Hi..
Find below one of the sample format of the same..
21st August 2007
To
Mr.
Designation.
Sub. – Warning Letter
Mr.
It has been observed that your behavior towards your subordinates, colleague's is not upto the mark, which is against the code of conduct, resulting in willful insubordination and gross negligence of duties, in your capacity as Designation.
Not following the code of conduct is a misconduct for which you are making yourself liable for necessary action.
You are hereby warned to refrain from such activities; failure to do so shall invoke appropriate action.
You are further advised to submit a written explanation on your unethical act as soon as you receive this letter.
Kindly treat this as very urgent.
For, Company name
Name:
Designation
Regards,
Amit Seth.

"Attitude" is difficult to identify and measure, so do not classify behavior as attitude. Abraham Lincoln put his foot down against slavery; would the same behavior be okay in your company... maybe not.

The only solution is training or counseling sessions. A salesman in a showroom may be from the fringes of society; what is acceptable in different cultures may not be good enough in another scenario. If he is not able to connect with an upmarket client, he needs cultural training or behavioral training to bridge the gaps.

This same phenomenon is depicted in juvenile delinquency too, so proceed with an open mind and sensitivity (absolutely no biases).

Surya Vrat