Hi, it depends on your profession. Some professions may require qualification prior to work experience. CIC asks the following:
ii. In the last 10 years, how many years of skilled work experience do you have?
It must have been paid, full-time (or an equal amount in part-time), and in only one occupation (NOC skill type 0, A or B).
This makes no reference to whether you were qualified or not. However, each NOC has a minimum qualification requirement. Although CIC does not ask for evidence of meeting this, you must ideally meet this to claim experience in this NOC.
Hope this helps