work reference letters

[last_try]

I'm CEC candidate and have applied under primary NOC 2011.

I have listed 2 years of canadian work experience under NOC 2011 and 3 years of foreign experience under the same NOC code.

I have also listed other experience in the same company under different NOC code.

Is it ok, if I produce work reference letters for my primary NOC (2 years of canadian and 3 years of foreign..) or should I be producing work reference letters for all the NOC listed. Kindly advice.