Should Duties Be Mentioned On Letter- Canadian Immigration Purposes

Dear frnds,
Can anyone help me out with the format of experience letter which is required for Canadian Immigration purposes.
I am bit confused here. The relieving letter i got from my organization (from India) only includes my Job designation along with the joining and relieving dates. So, if someone can tell me if i also need to get the duties mentioned on my experience letter to file my immigration here in Canada.
Awaiting responses.. thanks in advance to all..
15th February 2010 From Canada, Belleville

Dea Sir
I am enclosing here with my resume for your kind information. i request you to kindly provide me the model of advertising accouts executive experience certificate model for canada immigration and my resume.
Regards
C Kishore Kumar
24th July 2011 From Oman, Muscat

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