I am planning to apply for a open WP for my wife online. I was checking the IMM 5710 in the below link and it asks me to fill details of the prospective employer. But my wife does not have any offer letter. Can I write as "not applicable" in this section? Did anyone
http://www.cic.gc.ca/english/information/applications/extend-worker.asp
http://www.cic.gc.ca/english/information/applications/extend-worker.asp