You need to put exactly what you got from WES. If you put anything different than what they have given in their evaluation, your application could be rejected. There is a recent case where an applicant who has a Bachelors and a Masters degree from India. His WES evaluation mentioned his Bachelors as a Canadian 4 years bachelors and his Masters also as a 4 years bachelors. He, however stated in his application that he has a Bachelors and a Masters and his application was rejected on this ground after 5 months.
See page 139 of this thread
http://www.canadavisa.com/canada-immigration-discussion-board/reasons-for-rejection-t306713.2070.html and check the user Gabbana and follow it on next two pages.
Your WES report should look like this:
Credential Authentication: Official transcripts were sent directly by the institution
Country: [NAME OF THE COUNTRY]
Credential: [NAME OF YOUR DEGREES - XXXXXX,XXXXXX]
Year: [YEAR]
Awarded by: [NAME OF THE EDUCATION INSTITUTION]
Institution Status: [RECOGNIZED]
Major/Specialization: [SPECIALIZATION]
Canadian Equivalency: BACHELOR'S DEGREE (four years)
If this is what is says, then you cannot write two degrees because WES only sees it as one degree. However, wait for other forum users. The above is what I received, however, I have a master's and a Doctorate, so it did not matter to me. Lets wait and see what others have done and has anyone been successful.
Hope this helps and answers your question.